It's always good to have a mixture of characters and backgrounds in order to keep things interesting in the roleplay. If everyone was the last surviving alien from the Planet <Insert Destroyed World Name Here> then we'd soon run out of potential plots to uncover.

Lucky so far there seems to have been enough diversity, even within the same specialisations, to keep things interesting for a while. Although a few more Tech characters may be nice to have, to balance things out a bit.

Any rogue androids from the future on the loose we could chorale into our little gang? A sentient battle tank perhaps, or a shapeshifting alien spaceship AI?