They Call Me Jeeg

Enzo, a lonely and misanthropic small time crook, uses the superpowers gained after falling in the Tiber river to chase down a crazy gangster called "The gypsy".
After coming in contact with radioactive waste, small-time crook Enzo Ceccotti gains super-strength. A misanthropic, introverted brute, he uses his new powers for personal gain until he meets Alessia, a mentally ill girl who believes Enzo is the hero from her favorite anime Steel Jeeg.