Well there are 3 adventurer professions and 3 scholar professions so there is room for another warrior profession for sure.
Here’s my suggestion:
Totem Barbarian
or let’s make it more guildwarsy and call it the:
Ritual Barbarian
Essentially a shaman or ritualist who wears heavy armor. The “Totem” playstyle would be a welcome addition to the current line up of playstyles. Nature magic is not really represented in the game either, aside from racial skills (yes I know elements are natural but I’m talking plant/animal magic).