Finn Appears in Fire Emblem: Genealogy of the Holy War & Fire Emblem: Thracia 776

Finn is a knight who serves Leif, the prince of Leonster. When it comes to combat wielding a lance, there are few people in Jugdral who can keep up with him!

When he was younger, Finn served Quan, Leif’s father. Having received the Brave Lance as a gift from his lord, Finn was an invaluable soldier on the battlefield.

When Leonster was defeated, Finn escaped, taking Leif and Nanna to safety. Afterward, they traveled the realm while fending off their pursuers.

Finn had met with a series of misfortunes. But throughout his quest to help Leif rebuild Leonster, his loyalty never wavered, and his Brave Lance never failed to find its mark!

Finn basically Endured Everything, from Belhalla Massacre, Aed Massacre (Quan and Ethlyn's Death and Altena is taken Custody under King Travant of Thracia), then Finn gets Pursuited with a Young Leif and Nanna by Thracian Dracoknights, damn he's Living in Hell, but he endured it

You could basically choose which Lover Finn has, neither: Ayra, Edain, Brigid, Sylvia, Tallitu, and Lachesis (Lachesis x Finn is too Popular to Fire emblem)