simple question nothing more...

CS is when people hate you, or just some kid which PMs everyone so you get CS.

Minion - is staff is his own section and can remove/close threads etc.
Minion+ - The same + can see edits and some more.
Admin - Semi-owner of MPGH i think and can do everything like minion etc
Dave84311 - the owner of MPGH and can do all he wants.
Donator - if you donated atleast 25$ to mpgh you get some options to have 200x200 avatar size etc...
Former Staff - Ex minion.
Global moderator - Mod in all sections
Mem lvl 2,3,4,5 can go to another secret section for elite members.
GFX team - wiki editors and site editors is the same as EDITOR imo.
MPGH VS - vip support, but the vip section is deleted now.
Middlemen - Official middlemen
MPGH TM - trusted member
MPGH SP - someone who i too active i guess
Princess - a girl.
Contributor - someone who made alot of hacks/usefull stuff for the community

Did i forget something?

Here are the tags of it.
http://www.mpgh.net/forum/2-general/357286-staff-special-pictures-thread-3-0-a.html

@Denelf covered it pretty much
Editor : Someone who officially edits and works on a specific wiki.
GFX Team : Someone who edits images and stuff ? Dont really know
Trusted Member : A known and trusted member of MPGH.
Super User : Kind of the same as TM in my opinion

Ask him