When Frisk is looking for Asriel, she actually finds a new brother instead.
This is a crossover of Undertale and Boku No Hero Academia.
The few main characters being...
Shoto Todoroki, Katsuki Bakugou, Deku, Tomura Shigaraki, Himiko Toga, Dabi, Ove...
"Alright, I asked you guys to come here 'cause there's a new member of the group!" I said. "Who..?" Frisk asked. "Gaster, come out.." I whispered. "Gaster."
Everyone gasped. "But-but he "sabotaged" our things!" Frisk said. "No, it was all Betty. I promise. I didn't mean it. Also, what happened to Chara's voice was Betty's friend. She did research and the article was actually false. It should've said Betty, not Gaster. nothing happens if you read Entry Number 17. I wouldn't care. I like you guys! Betty's the bad guy here..." He said, in a determined-ish voice.
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"That's RIGHT!" Betty suddenly yelled. I didn't invite her! "How did you get here!?" Well, whatever. Time to deal with my enemy and end this once and for all.
"That's it, Betty. How long have you been doing this PRANK!?" I yelled. "Oh, no..I did it for revenge. It's no prank." She said. "But why do you hate Gaster, and why FORCE him to do this!? i thought I could trust you. You're just an idiot. Like Flowey.. (no offense Asriel...)" I said."Well, why not finish this!?" Betty said. "Deal."