Goodbye to the Death Knight (Switching)

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Personally, if you intend to go the StarCraft route, I think you should stick with Abathur. While I'm sure you could do a good job as Kerrigan, I feel that Abathur suits your style of roleplaying better. Maybe it's just my impression, but you seem to do quite well as the more 'monstrous'/alien characters. That's not something a lot of people can pull off well (hence why there are so many humanoid/near humanoid 'aliens' in sci-fi shows), so I think it would be great if you capitalised on that talent.

Aside from that, I pretty much agree with Sona being the most viable second contender. Since I'm one of the lucky few to know about her, I know firsthand how much of a fun character she can be. That said, unless she develops an interest beyond just treasure or you bring in Rafhorn as an NPC, she might end up being more directionless than Abathur would be. That's really the danger with mercenary-type characters; they offer a lot of freedom, but that freedom can also wind up being a trap if you end up not knowing what to do with them.

Personally, I would go with Abathur. You have detailed knowledge of SC lore and having more SC characters around would certainly be fun. Plus, he still offers enough freedom that you could do a lot of things with him.