Is it normal to visualize what other users look like?

I usually imagine users looks based on their name.
Dirtybirdy is... well, a bird.
Tommythecat is a cartoonish cat.
RomeoDeMontague is this young guy from the dark ages.
Myboyfriendsbitch is a young half naked woman with her beefy boyfriend always walking around behind her not giving a shit.
Icame puts pictures in my head that I don't want.
Bananaface is a pretty face surrounded by bananas.
Thegypsysailor is a bearded, blond sailor on a boat with a beautiful view behind him.

Maybe that's why my own name is so non visual.