Wikipedia
Zzzax
Zzzax is a fictional character appearing in American comic books published by Marvel Comics. It first appeared in Hulk #166 in August 1973.
Created by accident during a terrorist act, Zzzax is a being of pure electricity, capable of absorbing and discharging powerful currents of electricity. Its size and strength depend on the amount of electricity absorbed. It can also absorb human brain energy, temporarily taking on the personality of the victim.