This is a mech version of Saitama from One Punch Man. Saitama is a hero who doesn’t seek recognition, yet still ends up being heroic unintentionally. He defeats all his enemies with a single punch, which is where the show gets its name.
The idea behind this creation is that Saitama is already extremely overpowered, so if he were to become a mech would he be even more powerful or less powerful?

I scaled it down to 65% of the original size, but as you can see its still detailed. Every part fits perfectly.