If you run your own Mastodon server, it's really easy to add custom emoji to make it personalised. Here's a guide for admins on how to do it:

๐ŸŒฑ fedi.tips/using-custom-emoji-o

People on other servers can see your custom emoji, but only you can use them (unless the other server adds the same custom emoji).

You can also clone emoji from other servers, and also block emoji if you see something unsuitable.

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If you have a fediverse account, you can quote this note from your own instance. Search https://social.growyourown.services/users/homegrown/statuses/115985840366394269 on your instance and quote it. (Note that quoting is not supported in Mastodon.)