Currently there is no way to create your own fairy chess pieces. If you have ideas, speak up! (No spamming though)
Any Tool to make fairy chess pieces?

Ask lichess developers as they have a make variant updates much more and have zero bugs. Not to lie don't combine pieces or just make pieces to make them. Is your piece 3/4 as good as the pawn, bishop, knight, rook, queen, (Any type of king piece) king? if it's not 3/4 on average or 3/4 of the king if it's a royal piece then you have failed! (Failing means it won't be added, even if you above 3/4 yours odds are low!!
i have so many ideas of fairy chess pieces but i dont know how to make them, anyone can help me?