Right now the Diona have no customisation apart from eye colour, which you can barely see. Diona are my favorite race to play as and roleplay as, but i feel like there's not enough to them, as for customisation, hair styles would be nice in the form of leaves and such in different styles, maybe different body types for different plants, as in different colours and maybe different models. So as far from customisation that's what i'd like to see, because at the moment every diona looks exactly the same.
As for balancing there's only a single problem i have with them, they are so goddamn slow, their run is slower than a humans walk, i understand why they're slow and it makes sense, but i feel like they should at least be made a little bit faster, you cant run away from anything and getting around takes goddamn forever, and it makes a lot of jobs hell. as for speeding them up and keeping them balanced, i think it'd make sense for them to be more susceptible to fire, as in taking more fire damage and harder to put yourself out by rolling.
Also one last thing, i found a bug regarding the Diona, well i'm not sure if it's a bug but it doesn't make much sense. Diona nymphs need air, i dont get why adult ones dont and they do, and this also causes another problem, when you merg with a nymph as a adult, you cant choose to drop them, they can only de attach. so if you go into space while having them merged with you, it kills all of them. I dont mind if they completely remove merging, but i think this should be fixed
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Also another thing that would be nice for roleplaying sakes, other races have some chat modification, and i think it'd be cool and make sense if maybe their o's and a's where extended, so it seems like they are talking slower