Hey there, I'm so happy to hear that you made multiple character with my sheets!
As for a collaboration, I'd love to work on either adapting my booklet to another game or make a new one! Unfortunately, as of now I can't really dedicate myself to a free collaboration, but if you were willing to commission me for it, it would be more than doable! I
In case you're interested, feel free to contact me directly either via mail or social.