NG Chat Emoticons
NG Chat uses Emoji One (click the link to search through all available emoji) as well as 546 custom emoticons and reaction GIFs. If you're using a mobile device, your device's emoji selector will work, however, all emoji across all mobile devices will use Emoji One graphics so they might look different once you send a message.
Here is a list of all custom emoticons / reactions GIFs and their corresponding short codes (type these in chat). Some of these are supporter only. For example, all reaction GIFs that begin with "nga" and possibly others. If one of these does not work for you and you're not a supporter, then it's likely a supporter only feature.