Honestly, I find the focus on his anger a bit overblown sometimes. The big one against Todoroki during the Sports Festival wasn't really an 'outburst' in the traditional sense—it was a desperate, frustrated plea. He wasn't angry at Todoroki, he was angry for him, seeing him waste his potential out of spite for his father. That moment didn't make them rivals; it fundamentally changed their dynamic. Todoroki started seeing Deku not as an obstacle, but as someone who genuinely saw him. It built a foundation of respect that rivalry alone never could. After that, their competition became almost cooperative.
That's the pattern, really. His 'outbursts' are never about asserting dominance or putting someone down. With Bakugo, when he finally snaps and tells him to stop looking down on him, it's a declaration of self-worth. It doesn't resolve their toxic history, but it forces Bakugo to engage with him on different terms. The relationship becomes less one-sided torment and more of a brutal, acknowledged race. So they don't damage his rivalries; they recalibrate them. They introduce a raw honesty that cuts through the posturing, forcing the other person to confront Deku's unwavering core of empathy, which is ultimately more unsettling to a true rival than any show of brute strength.