In most messengers, we have the ability to download and use custom emoji sets, GIFs, and even stickers. These may be based on a theme, or in general, look better than the ones that are pre-installed. If you have experienced using custom emojis or GIFs, you will know exactly how awesome it is to use the absolute perfect emoji or GIF for your replies.
The ability to add custom emoji support to Microsoft Teams was requested almost four years ago within the Microsoft Forums. Loyal Microsoft Teams users did their best to get some sort of reaction from Microsoft towards this petition, but, unfortunately, to this day, the feature remains on the backburner, with no definite date as to when, or if, this feature will be added to the platform. So, right now, you will have to make do with the emojis that are pre-installed into Microsoft Teams.
