I actually really like the idea (possibly fiddlesticks ward skin, or immunity to certain cc, like fear, or possibly a reflective spell-shield?), but I think riot, in general, likes the "All in good fun, within limits." That would explain the almost-but-not-quite cartoonish map, and the way some champions are portrayed; imho they like mature parody rather than up-front joke content, as well as continuity (meaning that farmer McDonald would need to be scottish militia who stumbled upon old pictish ruins; or somesuch.)
TL;DR Working on continuity within the cannon would yield (hehe) great ideas on this one.