Bakugou Katsuki, Son of Loki
Basically an AU in which, instead of being the son of Bakugou Mitsuki and Bakugou Masaru, Katsuki Bakugou is biologically and legally Laufeyson Katsuki.
Mitsuki & Loki met one when Loki accidentally ended up in future Japan while time-travelling for leisure, and ended up hitting it up. Three years later, Mitsuki is pregnant with Katsuki, but Loki has to return back to Asgard for some super urgent matter and Mitsuki never gets to tell him.
Yada yada ya, fifteen years later, Katsuki has been secretly hiding his "weird second quirk" (what he's been referring to his seiðr as) his whole life, not knowing why it exists or where he got it from. Stumbling upon a picture of his mother and Loki, he shows it to her, demanding answers, and she finally tells him about his heritage and Loki...
Finally having an explanation for everything weird going on his life, he, with an anxious but inquisitive and supporting Izuku Midoriya, decide to start looking for his father, Loki, the Norse God of Lies, Michief, and Chaos. Katsuki has a whole lifetime to catch up on after all.
[In my head I imagined this as containing both BkDk & FrostIron, but you can wrote this with both, one, or neithee if you decide to.]
[Also, wow, this reads a lot more like a story sumnary than chapters 1 & 2 do, lol. Guess I was more passionate about this particular idea than I thought, oops?]
[P.S. Credits to this fic for inspiring the whole time-traveling/BNHA is set in a far-away future from the current world of the Avengers idea by the way, the concept was super interesting and I quite liked it.]