I think if you are worried about what the templates will be used for, it is enough to simply add in the terms of use that they cannot be used in games containing X, Y, Z. But I don't want to force you to do anything, of course :) My game doesn't intend to contain any "controversial content". The templates themselves would definitely be helpful, because I guess you wouldn't animate every character, even the side characters - that's understandable, it's a lot of work.
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It’s definitely something to think about. I appreciate your point of view and I’ll announce or something if and when I do offer the templates but in the meantime I’ll think about adding some animations to at least some of the sprites (“heroes”, like you suggested) after the next Nine Realms thing I’m doing (it’s portraits!).