Oi, this is very painful indeed!
Currently, there are no more skin configurations possible

We used to have hairstyles, glasses, all that jazz..but the models were to be redesigned and customisation to be reimplemented.
It's about that time where development on Deathball largely stopped however, and it is yet to be continued
The basic gameplay is still near perfect as it is however balancewise etc. imo
Superiority of other versions are largely based on nostalgia and the lack of a proper community atm

Gameplay-changing features that could be implemented - and would have been - like the karmaball won't really change a lot how Deathball is played.
The only real problem is that Deathball doesn't seem to be played as much as before
Still, I hope you'll have fun playing deathball, even without the customisation, and I hope you find your way around the community regardless of the current depression of player activity :p