Deku: I have a dad but no one knows were he is...

I have a dad but cheated on my mom and used her as a sex slut and the divorce person thingy goes on his side cause he believes his lies so I DONT HAVE A DAD!!~~

People think that he is Todoroki's brother and I guess they have proof to back it up. Dabi's burns on him are from when he was little and couldn't control his quirk so he burnt himself. But after his father saw how he couldn't control his quirk he abandoned him befor Todoroki was born or at least when he was young and didn't remember. I dont know if this is all true or not this is just some people's fan theories