Hi there thanks for posting in the community. Lucidspark currently supports the following twenty-four emojis:

You are able to add all twenty-four to a single object. Once you add an emoji to an object it will appear below the object highlighted in blue. Any reactions that a collaborator adds will be shown with a white background. 

To see which specific collaborator added an emoji simply hover that reaction. 

For more information please view this Emoji Reactions article from our Help Center and post any additional questions below.