There is no specific design for human, elementals, elves, faes, fairy, nymph, etc. It you want your OC to get involved in Asorium, feel free to design and use them however you like (Go wild basically). When using them for events, just make sure they're not overpowered but don't let my world building stop you from being creative with your character <3
Some species especially Semi-open and Closed requires a Masterlist