I will let the others vote on the male/female issue. :) You should have an answer tonight before we get good and started. :) Maybe make tweedledee a girl and tweedledum a guy? Twins or split personality even.

Edit: Dragonbeastmode - Feel free to put in a CS as the Jabberwock... that'll be interesting since usually he's a bad guy. Did you read the description of the rp though? This is going to be pretty twisted...