Hellgate:London

[Wyrm]

Guild Wars only had 5 (!) upon release, with only an additional 2 slots per PAID Expansion pack (if you linked them; 4 slots if you didn't, which sort of defeated the purpose of "expansion content"). Eventually Guild Wars opted for paid character slots (at $10 apiece, no less), but that took them over two expansions to produce.

Minor correction. GW has 4 char slots for a starting account and 2 per expansion, with a bonus one included with the NF preorder (but only if you have a NF retail key to go with it), for a maximum of 9 slots if you don't buy additional ones from the online store.

Supposedly, if you buy the platinum edition of the game (Proph + GW:EN) you get 6 if you create a new account, but I have no idea how that translates once you add keys for other campaigns.