(He is from record of Ragnarok anime so technically over the usual age limit around so I'll just say 110+)

Simo is presented as a cold, calm, dignified, and quiet individual, his stern expression rarely changing. In the eleventh round, he was shown to be completely unfazed when Loki summoned a group of recreated Gods[3] and even when Loki multiplied their numbers to create a whole army, Simo remained stoic. He also didn't show a reaction to any of Loki's taunts, displaying his level-headedness.[4] Simo appears to be a patriot, as his main reason for fighting in Ragnarok is to defend his fatherland, Finland.[5] Moreover, he seems quite confident in his abilities since he told his dog that he'd only be gone a bit.[6]

He is highly intelligent and perceptive, as he saw through Loki's tricks immediately.

Underneath his stoic exterior, Simo is actually a deeply compassionate person. He despised killing, and despite it being for the sake of his fatherland, Simo was pained over the fact that he had to kill people[7] and during the Winter War, ever since his first kill, he was unable to sleep a single night.[8] Instead, he would remember the faces of each and every person he killed that day, and repeatedly apologize to them.[9] Agonised over the choice. Simo considers his acts of killing as unforgivable and views pain as a way of salvation: when a stray bullet ricocheted and pierced his jaw, Simo felt like he was "saved"[10] and during his fight with Loki, he continuously used an ability that converted his organs into bullets, believing it was atonement for what he had done.[11]

Simo kneels for Loki

Simo kneels out of respect for Loki

Furthermore, after successfully killing Loki, Simo kneeled out of respect for his fallen opponent[12] and still felt pain from having to kill the God, despite the fact their battle was one to decide the survival of Humanity.[13]

Simo seems to care for his dog, as she is seen accompanying him when Radgridr went to find him[14] and during his introduction into the arena.[15] He showed some affection for his companion, patting its head and instructing it to wait until he came back.

Simo has a habit of counting out loud how many bullets he's fired, which usually corresponded to how many people he's killed since he's always had a 100% accuracy rate.[16][17][18] The only exeptions from this are the copies created by Loki's Heimskringla, which Simo does not count into his main kill count, probably due to the copies not being strictly alive.

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Abilities

Overall Abilities: As a participant of Ragnarok, who harbours enough prowess and mastery to be considered the perfect candidate for Loki by Brunhilde, Simo Häyhä comes as being an individual of uttermost power and influence.

Titled Humanity's Ultimate Sniper, Simo had always a 100% accuracy rate in his life on Earth, which during it, he achieved a tremendous kill amounts of 542 Soviet soldiers during the relatively short Winter War (Lasted only for 3 months, 1 week and 6 days). Simo henceforth gained the name of White Death, as the Soviet troops regarded that killing spree as a supernatural event. Furthermore, Simo attained the "Miracle of Kollaa" by singlehandedly expelling a brigade of 4000 Soviet troops during the Battle of Kollaa, where the soldiers immediately fled from the Finnish river as they recognised the person behind the snipes. To denote moreover to his feats, Häyhä has never been discovered at all during that war service, and had only a sustained a single injury from the war (Which was a random, unintentional event).

Physical Abilities

Godlike Endurance: Simo shows extreme endurance due to the cost of using his Völundr which literally removes an organ from his body to transmute it into a bullet capable of harming and even slaying Gods. After having one of his kidneys and his liver removed Simo shows no sign of pain and calmly aimed and shot the bullet that slayed Loki's entire army of Thor, Odin and Heracles clones. During the end dates of the Winter War, Simo survived being shot in the jaw by a reflection-enhanced bullet that was incidentally fired by a dying Soviet soldier and he felt relieved by the pain he recived.

Godlike Speed and Reflexes: Befitting his capability as a sniper, Simo is able to move at extreme speeds, allowing to switch positions from one point to another, crossing the distances in a short amount of time. He is so fast to the eye that not even Heimdall is able to perceive him moving, even with great number of cameras placed in the arena, the Norse God was unable to keep track with his movements. Moreover, Simo showcases a superhuman level of agility. During his fight with Loki, he displays it when he was seen in a mountain aiming a snipe, only to be seen next moment switched to sniping from a log. Moreover, right after from the log, Simo had already moved on a tree.

Enhanced Eyesight: Simo showcases unfathomable eyesight as during his fight against the Norse God of Mischief, the White Death was miles apart from his opponent and his replicas of Ragnarok fighters, yet was able to perfectly view them despite the vast distance, and deliver perfect shots at him and his army of duplicates. In the past, Simo was able to snipe down 542 Soviet soldiers, all while at a distance of 0.3 miles away from the incoming troops. With each kill, Simo furthermore apparently had a perfect vision to their appearances, as he had memorized each face and person he had shot, demonstrating his superb sight yet again. Another testament to his impressive eyesight, is that he was able to achieve his immense kill list without the use of a scope, but rather with just an ironsight.

Mental Abilities

Expert Physician: Simo shows some knowledge of the Human Body, knowing what organs are vital or not vital to sustain life, giving him a "grace period" where he can trade said non-vital organs to use as God-slaying bullets before having to use organs that are vital to sustain life.

Indomitable Will: Despite his compassionate and altruistic nature (Which caused him great sorrow for each kill he had), Simo Häyhä harbours a strong will. Despite being under the pressure of his "sins", for the sake of his beloved Finland, Simo endured the "pain" and willed himself to continue to defend it. In Ragnarok, Simo displayed his high willpower for another time by the usage of his Isänmaalle, in which he converts his own organs into God-harming bullets, which can even slay a one; Simo shows no reaction to the grievous pain he afterwards feels, as he merely views it as an "atonement" for his "sins".

Fighting Abilities

Master Marksmanship: Simo is considered the deadliest sniper in human history. Nicknamed "The White Death", he killed about 542 men during the Winter War that lasted less than 100 days; For each kill, Simo had to shoot at different heights and angles, while being great distances away from the enemy soldiers, yet still had a 100% accuracy rate. Present day, Simo was able to devastate Loki and his army of some of the Gods Fighters with just 2 shots, aided by the effect of his Völundr.

Master Stealth: Simo can hide his presence by remaining completely silent, to the point that Radgridr did not notice him approaching from behind, only noticing it when he spoke. This also extends to his time alive, where his clothing camouflaged him in the snow, hiding him from Soviet Russian enemies.

Supernatural Abilities

Golden Age: As a human soul in the afterlife, Simo Häyhä possesses the appearance and skills that he had during his Golden Age, the age in which he was at his peak.

Techniques

Isänmaalle Isänmaalle (Reaper’s Contract) (死神の契りイサンマーレ, Isanmāre)[19]: Simo uses one of his organs (kidney, liver, etc.) as "material" to forge bullets which can damage and even slay Gods. This move can bypass the Völundr's usual working, which only makes the Human's "body" and the Valkyrie's "weapon" capable of injuring Gods. However, it carries severe risks to Simo's and Radgridr's lives, and because the number of nonvital organs, it can be used only a very few times. According to Brunhilde, in spite of the immense agony caused by this technique, Simo sees the pain as atonement for the deaths he caused. It is currently unknown whether the function of the bullets is affected by the organ used to make them. The process of making the bullet is very fast, not taking more than half a second.

Anti-Gods Sniping Profusion of Flowers Sniping Against the Gods: Ilmatar (Profusion of Flowers) (対神狙撃術: 万花繚乱イルマタル, Taishin Sogekijutsu: Irumataru):[20] After creating a bullet from one of his kidneys, Simo fires the bullet, which scatters itself into countless projectiles midair in a swirling motion, similar to flower petals. These projectiles are so powerful that they were able to mow down an entire army of recreated Gods, including a reinforced copy of Thor. This bullet moves twice as fast as the speed of sound when fired. According to Jack the Ripper, this move possesses all the advantages of a regular sniper bullet and a wide area shot, without any of their drawbacks.

Heaven Piercing Swan - Lemminkäinen Sniping Against the Gods: Lemminkäinen (Heaven-Piercing Swan) (対神狙撃術: 天突っ白鳥レンミンカンネン, Taishin Sogekijutsu: Renminkan'nen):[21] After creating a bullet from his liver, Simo aims at a target and fires a powerful rotating bullet that is seemingly able to pierce through anything. It is strong enough that even after Loki was able to deduce its trajectory and shield himself with a copy of Odin, Thor, and Heracles produced by Heimskringla, and with the Shield of Skuld, the bullet was still able to pierce through all of his defenses, and seemingly hit him in the head.

Mielikki Sniping Against the Gods: Mielikki (Breath of the Spirit) (対神狙撃術: 精霊の息吹ミエリッキ, Taishin Sogekijutsu: Mierikki):[22]After creating a bullet from his spleen, Simo fires an extremely fast and precise bullet, said to reach 'godspeed'. It's fast enough to pierce through it's target in the split fragment of a second, without the target being able to react. Simo has used the Mielikki to take down what he believed to be a copy of Heracles, while in truth, it was the transformed Loki, who has disguised himself as the copy of Heracles and pretended to be shot down to ambush Simo.

Ukonvasara Sniping Against the Gods: Ukonvasara (Afterglow in the Heavens) (対神狙撃術: 天空の残光ウコンバサラ, Taishin Sogekijutsu: Ukonbasara):[23] After creating a bullet from his pancreas, Simo fires a rapidly rotating bullet for a headshot. This is his fastest and most precise bullet: Loki, whose reactions are sharp enough for him to react to Lemminkäinen, was unable to react to it at all, with its speed surpassing Loki's attack speed, allowing it to just scrape itself slightly against the God of Mischief's scythe instead. This was the move which earned Simo his 543rd kill, and also earned his win in Ragnarok.

Equipment

Simo doesn't trust Loki is dead M28-30 Rifle[24]: A Divine Weapon in the form of a Mosin–Nagant rifle provided by the Völundr of the 8th Valkyrie, Radgridr. Gives Simo the means to fire the God-Slaying bullets and using his organs as the price to pay for the former.

Quotes

(To Radgridr) "You called for me?"[14]

(To Radgridr) "Let us go... for the fatherland."[5]

(To his dog) "Odota (Wait). I'll only be gone for a bit."[25]

(To himself) "Yksi (One)..."[16]

(To himself) "134... 135... 136... 137...one hundred... 138... I'm sorry."[8]

(To himself) "This... All of this... this was unforgivable... and yet... I feel that... just a little bit... I've been saved..."[26]

(To himself) "Kaksi (Two)..."[18]

(To himself) "Kolme (Three)..."[22]

(To Loki) "I... will never mistake... the pain of taking a life."[27]

(To himself) "543..."[13]

Trivia

Simo's design was revealed early, thanks to a poll on Twitter created by the authors of the series back in July 2019, asking fans which design they wanted to see prematurely. Simo won the vote with the largest ratio, and thus his design was revealed in November of that same year.

After fighting in the Winter War and recovering from his jaw injury, Simo Häyhä became a dog breeder. The dog we see sitting beside him in his design preview is a Karelian Bear Dog, a Finnish breed known for being a quiet yet powerful hunter. Bred to hunt large and aggressive game, the Karelian Bear Dog stealthily pursues its prey and only barks once the hunt is over or to alert its owner.

Most of Simo's techniques are named after mythical beings in Finnish mythology. Major exception is his signature technique, Isänmaalle which mean homeland, and his strongest technique, Ukonvasara (Hammer of Ukko), weapon of Ukko, the supreme god of Finnish mythology.

He is the youngest of all of the Einherjar (being born in 1905 and passing away in 2002).

Simo has a similar personality to his real life counterpart - the real Simo Haya was inordinately humble after the war and in several interviews simply stated he "did his duty", and sought no fame or glory.