You can use any size you want because in the end the emojis will be seen pretty small inside the game. If you use high-res Unity will auto-resize, if you use something smaller Unity will fit in best it can. try to use something between 480p to 720p that way your PC will have no problems exporting your work.
i think. for emoji should be 1:1, and for platforms should be 1:6. how @ccplaylabs ?
You can use any size you want because in the end the emojis will be seen pretty small inside the game. If you use high-res Unity will auto-resize, if you use something smaller Unity will fit in best it can. try to use something between 480p to 720p that way your PC will have no problems exporting your work.
Here's my contribution. You can contact me on discord dimensco#8267 https://utopian.io/utopian-io/@dimensco/emoji-character-design-for-jumpmoji