Higher quality emotes/higher res
Chat is an important aspect of every stream, one of the biggest upside with mixer is the FTL and instant communication that happens between chat and Streamer.
But a chat is just a wall of text with no flavor unless you have some emotes (imo).
Now there is already an emote system in place at mixer but the quality of the emotes are lacking and it doesn't have anything to do with what the emotes are picturing.
Being restricted to 24x24 the resolution is so bad that most seems blurry if they are not pixel art. Compared to other major streaming platforms mixer is severely behind in this areas.
Emotes are a part of streamer culture and something communities can rally behind, I think implementing higher quality emotes with higher resolution option would really benefit mixer a lot.