Sword Familiar from Castlevania: Symphony of the Night. I just love that game. My avatar is the Star Dragon Sword from Suikoden though, but they are pretty similar.
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RE: Help me find next multiplayer game (PC)
Might not be what you are looking for, but...
Do you have controllers? Have you tried Earth Defence Force 4.1? It's a TPS-like game where you fight giant insects, aliens and the sort. Lots of different weapons, vehicles and such. It's pretty easy to get into, and you don't have to play for hours on end if you don't want to. Just play a level or two here and there online with your friends. Five or six different difficulty settings, so you can adjust that to suit your needs. It's mainly co-op though.