This is Son Goku from Dragon Ball Z!
It's part of Figure-Rise Standard model kit line by Bandai and requires assembly, but - like gunpla models - there's no need for glue and the parts are pre-colored.
The resulting figure is highly detailed and articulated.
It's provided with interchangeable parts: 3x facial expressions, 5x different hands and parts for the Kamehameha!
Separately sold accessories