I have a few different characters which could be interesting depending on how you wanted Charki's character development to go!
Envy here could make an interesting rival as they're currently trying their hardest to be a good king but can be awfully snarky and sharp-tongued, which I feel like she wouldn't appreciate. They're also the leader of the Sinful Seven (a chill group based on the seven deadly sins) so if you were interested in her joining a group, that could be fun! You mention she enjoys sleeping and lounging a lot, and the group is currently lacking a sloth, so that could work. xD
And then there's
@Kin-Kin who makes a great magic tutor. She's my oldest active character, and she's roamed the caves for 2 years and 5 months now, which makes her pretty wise. Still, she's also very prideful and relaxed. Generally easy to get along with but can be a tease if you don't appreciate her prideful nature.
Also
@Flit is a crazy inventor! they could be interesting since they'd be cat and mouse. Flit's a little nervous due to his small size but is outgoing and adventurous, and tries to be extremely respectful to the larger gems who he knows could eat him in a heartbeat.
@Charki