[hider=Nicknames Gunter would call everyone]
Angela-Tidal Wave

Gunter- Smokey(Probably what he wouldn't name himself)

Ryteb- Foxy

Patricia- Blood Girl

Aeris- Knight

D'Ren-Hell dude

Julia- Dorf

Ming- Feline

Zara- Merc
[/hider]

Probably something like this.

EDIT: Gunter is a Grenadier, so calling him Grenadier would be perfect.