Voice Packs!
As we know other MOBA games currently hold this feature and I'm not necessarily saying Riot should hop on the bandwagon. However I was discussing with my roommate (who also plays League) about announcer voice packs for specific champions. I mean, just think about it. Playing Shaco and he maniacally announces double kills, triple kills, or spectator dragon kills and baron kills. I think it would be a pretty neat feature; although what do other people in the community think?