How would you cast me if you didn't know me? (And if you don't very well, how would you cast me on first impression?)
na
by looking
based on good looks
sidekick, office worker, victorian clerk, author, journalist, or graphic artist.
actually, now that i think about it, the clean-shaven ones could be suitable for serious roles, so i guess i'm probably not good at judging someone's suitability for a role based on a headshot. ;)
oscar wilde plays, anything with received pronunciation really!
you have a lot of gravitas and weight (in terms of personality, not physically!). you can appear quite calm and approachable. characters that require intelligence and responsibility suit you.
from 4, i would cast you as a clever villain character. possibly even a tough love interest.
as you've outlined in your brackets above - i'd agree with those roles.
serious - moody - intellectual. you could do dark. you can do quirky.