The official Twitch Android TV app does not support BTTV/FFZ emotes, so its kinda useless imo, as that's the majority of emotes used now a days.
I have been using an APK i found here on reddit with BTTV emotes, but it does not support dark mode.
Is there any Twitch client for Android TV that supports both?
Your options:
https://play.google.com/store/apps/details?id=com.fgl27.twitch
https://play.google.com/store/apps/details?id=com.s0und.s0undtv
for transparency: i'm building one of them