After a great deal of musing, I've finally development a 'sona for myself! I'm quite fond of the guy.

Expect to see him turning up in a lot of macro and/or vore scenarios. That smirk ain't there for nothing, after all! And the hammer. That too.

A couple of things that aren't covered in full by the ref:

Although it's not indicated above, he's a self-taught chemist. This invariably leads to shenanigans.

The sledgehammer is clearly a friendship stick. The syringes are full of Happiness and Friendship (abbreviated to HF), NOT hydrofluoric acid (also HF). That would be ridiculous and unsafe. He's not quite strong enough to carry the hammer friendship stick, so he drags it about. Think Pyramid Head.

His claws grow quickly, so they tend to have erratic lengths. He compulsively scratches things.

He can control otherwise involuntary muscular movements much like you can hold your breath. By the same token, though, he can't do it forever.

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Art drawn by the very talented  ohohflamethrower!