Gadget and Maid Marion were the first two(I think) though I don't know which came first.
I know I saw Walt Disney's Robin Hood way sooner, but I'm not sure at what point I first developed emotions for the Maid Marion character. I think that wasn't until my teen years when, after not seeing the movie in the longest time, I saw it again and totally fell for the character, but then I don't remember, say, if that was before or after Chip and Dale came out, or what I did or didn't feal for the Maid Marion character beforehand. At any rate, those were my two really major furry crushes, though I've ceartainly had others since.