It would be useful if the following values could be added to each emote:

• Channel Name (e.g. "owner name") - Obviously the name can be retrieved from the "owner id" by doing another API request, but it would be nicer to require fewer API requests
• Tier - The "Get Channel Emotes" endpoint already contains a "tier" value, it would be nice if this one would also have it

Additionally, not all emote sets appear to be supported by the endpoint. For example the following emote sets (from the "emote-sets" tag and also valid emote sets in the v5 "Get User Emotes" endpoint response) only return an empty result:

https://api.twitch.tv/helix/chat/emotes/set?emote_set_id=472873131
https://api.twitch.tv/helix/chat/emotes/set?emote_set_id=564265402
https://api.twitch.tv/helix/chat/emotes/set?emote_set_id=592920959
https://api.twitch.tv/helix/chat/emotes/set?emote_set_id=610186276
https://api.twitch.tv/helix/chat/emotes/set?emote_set_id=488737509
https://api.twitch.tv/helix/chat/emotes/set?emote_set_id=537206155

Not sure if this is a bug or intentional limitation, but it would be useful if it would support all valid emote sets.