neither community is particularly active. in c/kirby, i’d say there’s only two people, including me, who regularly post or comment. i’ve posted two fanwork-y things to c/kirby; the first wasn’t very well received for some reason, the second was reasonably well received. so i don’t really know! they’re not really big/active enough communities to have a specific stance on fanfiction, i think

but if c/kirby gets more active, i’ll do my part in fostering a welcoming spirit towards fanfiction!

(…i know that r/kirby wasn’t particularly fond of shipping, as far as i could tell.)