This sounds fun! 1910s/1920s is a neat period, fashion-wise.
Alright, here's my little grump Masahiro:
(note: his hair/skin is actually supposed to be a little darker than this: this is an early turnaround, and I've tweaked it since) He's the grumpiest man you're likely to find in any crowd, but scratch that surface and he's not
all bad. Out of practise with this whole "having feelings other than anger" thing. His left hand is missing, cut off at the wrist, and he keeps that arm wrapped up in both bandages and his coat, because he doesn't like thinking about it.
Sometimes loses his temper completely and starts glowing blue and accidentally murdering anything close to him. As you do.