OH this is a fun question! I can think of... quite a few factors that would go into this choice. So strap in cuz I love overdoing things.

Format: -Character -Most likely end result -'Stuck in Elevator with them' rating out of 10 -Reasoning

Star Get out of the elevator safely 8/10 Star could use his magic to get us out instantly. Boring answer, but at least I'm not gonna have a panic attack in there.

Penny Talk tea with until the elevator is fixed 7/10 Penny would be really good at keeping me calm and would definitely have some Front Desk Gossip to share, to distract us until the elevator was fixed.

Milke or Silvy Have a not great time talking someone down from their own anxiety 4/10 Both Milke and Silvy would be pretty unreliable in this situation, as either of them [especially Milke] would try and put on a brave face but would fret the entire time and get worse as time went on.

Cinder Deal with a full-blown panic attack 1/10 Ya ever put a fox or a squirrel in a small confined space? Doesn't go well. Would not have a good time.

Comet or Myu [CENSORED] 11/10 Either Myu or Comet would be a wonderful choice if I wanted to get absolutely ██████ against the ████ ██ █████ and told to ████ █████ ██ ███ ███████████ ██████ █████ ████ ██ while they're trying to ███ ███ ████████ ███ ███████ ██████████ ██████ ██.

Joey Scream and shit pant 0/10 Joey would jump up and down in the elevator to make it shake while laughing. I don't feel I need to explain why this would be. ☝️. A Bad Time.