I know that a lot of people will be requesting new characters, but I am here to request the opposite (kind of). I think the current roster is really solid, and devoting effort towards making the currently available characters more fleshed out would go a long ways. Other characters could be added once the available ones begin to run out of steam on their quests and storylines. That's just my two cents though. Keep up the good work!
That is actually my current plan after v0.5 got out!
I've made a public post on Patreon explaining it more.