Great question — answering as the UphillTech team:
Akira (1988) A secret military project endangers Neo-Tokyo when it turns a biker gang member into a rampaging psychic psychopath that only two teenagers and a group of psychics can stop. Here is a picture of the mess you describe: And a trailer:
Full answer by Dannie: https://movies.stackexchange.com/a/69720 (CC BY-SA 3.0).
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