Don't worry about character sheet copyright. I've posted recently how copyright over existing printed sheets doesn't apply to roll20 sheets anyway, but that's really kind of irrelevant. For it to be relevant, you'd need an environment in which (a) game publishers object to people making their own versions of character sheets, and also (b) object to people playing their games! For point (b), obviously games publishers want more people playing their games, so they'd be crazy to try to crack down on roll20 character sheets. Most game devs will be thrilled to know there is interest in their games here. But the more important point (a): over 40 years of history in the gaming community has established that games publishers do not care if you make your own character sheets, even if you copy their own layouts closely. Some turn a blind eyes to it, others actively encourage it, but none will take active steps to try to stop it. Quite the reverse - there are games publishers who host fan-created resources like character sheets on their own websites. If it still worries you, you could easily contact the publisher of the game you want to make a sheet for and ask if they mind. Most publishers have websites with email contact details on them. There is one thing to be wary of: art assets. Don't use artwork on your sheets you don't have the rights to (unless its public domain, or has an open license that allows such use).
