My Hero Academia. The Fury of Firestorm: The Nuclear Men
Basically, after an incident, Izuku and Shoto gain the ability to fuse and Become the hero firestorm where their minds take turns controlling the body and being the voice that gives advice and can freely switch between forms even after they already transformed.
Izuku's Firestorm Form:
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Izuku has less fire and a more yellow suit.
Shoto's Firestorm Form:
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Shoto has more fire and a black suit instead of a yellow one.
Fury Form:
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When they get too emotionally unstable (whether that is anger, fear, or sadness it all depends) they transform into Fury. Fury is a rampaging monster with all the abilities of Firestorm but with neither izuku nor shoto's control. They both have to take control of their emotions to disperse Fury's form and return to the form they were in before Fury took over. Fury is his personality that is the combined form of izuku and shoto's emotions.
