The trio for My Hero should've been Izuku, Shoto, and Tenya. I will die on this hill if needed, it makes narrative sense to have Tenya as a major focus and rival instead of shitty Bakahoe who spends the entire story abusing Izuku.
Tenya Ida sees Izuku and immediately looks down on him and yes, we get to know him and know he's not like this - but it comes off like he's picking on Izuku because he's an easy target (IE, like Bakahoe who knows he can abuse Izuku and no one will do shit about it).
Tenya then sees Izuku cowering and runs past him only to then witness Izuku push through his fear to save Uraraka. And how does he react? Like a rival - "I would've done the same" while looking genuinely upset with himself, not Izuku (like shitty Bakuhoe who turns every moment of self reflection into hatred for Izuku). He becomes determined to be a hero that can rival Izuku and that is so much better than having an abusive bully with a one-sided "rivalry" as such a main character.
That one moment should've established a friendly rivalry, a HEALTHY one that would've given major character growth. And not just for Izuku, but also for Shoto - because where Tenya and Izuku could be foils, Tenya and Shoto are mirrors (legacy with high expectations on them, but one came from a healthier environment and is willingly trying to live up to the legacy he was born to).
Contrast that with Bakahoe who is legit just Endeavor with no PR training, an abusive asshole incapable of seeing his own flaws until it benefits him, he offers nothing in that aspect of character dynamics and I do not like how people/Hori inflate his character like that. Seriously, Bakugo Katsuki was narratively part of Izuku's BACKSTORY. His only major role after that should've been an ACKNOWLEDGED villain (because you can't change my mind, the asshole who actively tries to kill someone during class is a villain and no apology makes up for that).