@LuigiFan45  
Still think it’s cute anyway!!! Even I commissioned an artist to make a MLP and DL related cover art! (And I’m a fan of RPGs myself, so it definitely sounds interesting!)
 
Now for your genuine question,
 
So I’d say Euden and Ranzal are Earth Ponies (because they’re pretty strong). Cleo’s a Unicorn, and Luca is a pegasus. That being said, any ponified sylvans I’d imagine would have their bunny ears and perhaps bushy bunny tails be a part of their feature.
 
I’m basing their possible races from the adventurer lore such as personality, goals, hobbies and abilities.

@Tythen  
It’s honestly part of a small D&D thing I’m tryna cook up in an off-site community.
 
What pony races would you think Euden, Ranzal, Luca, and Cleo could fit into properly? Genuine question.

Aww! A ponified Elly! That’s wonderful!