Mr. "Ant" Tenna, often simply referred to as Tenna, he is Kris' old household CRT TV as a Darkner.

Tenna is an upbeat and energetic show host who thrives on entertaining his audience by both flattering and challenging his contestants. Beneath his lively persona, however, he is deeply insecure and egotistical, prone to panicking when things don’t go as planned. He recalls fondly how, as a television in the real world, he once brought Kris, their family, and friends together to play games and watch shows. Now somewhat abandoned, Tenna struggles with feelings of worthlessness, fearing he’s no longer interesting, that he’ll be discarded, and that he’s completely alone.

When confronted about his age, Tenna adamantly denies being "old." After the Trio discovers Toriel trapped inside a toy capsule, he spirals into panic and reacts by imprisoning them in capsules as well. His outbursts often turn destructive; he lashes out and fires his employees in bursts of anger, driven by his overwhelming fear of being forgotten and left behind.

He does however, have a kind heart. Another part of his motivation behind forcing the Delta Warriors into his show was so that he could entertain them. He has a strong desire to entertain, and bring others together. He even expresses frantic concern over Toriel, doing everything he can to assure she doesn't wake up.

Tenna is also seen to be rather enthusiastic and patient, as if you lose the physical challenges multiple times, he'll always ends his dialogue with "One more try! Let's CHALLENGE again!", demonstrating his confidence and faith.