Tonberry basic move should be to cast 'Stop' (or equivalent) on someone, walk up very slowly and then stab them for 9,999 damage. They should have lots of HP and Def so there is a panic rush to kill them before they wipe everyone out.

FFXI made it hate-based, but the core concept was still there.

As far as a beastmen race... well maybe. I'd like to see one or two of them just hanging out in dark corners of the world or dungeons as a bit of an anomaly first. (like Lone Coeurl is)