Felt
Rereading the Felt Intermission, it looks like the Leprechauns will get dramatically more useful after the 8th planet. There's...
Stitch and his healing effigies. He also seems to be pretty smart?
Sawbuck and his meatshield time-jumping shit. Until he gets Eggs, it's possibly a way to save time?
Matchsticks and his ability to move through fires. Assuming that Caliborn is acting within expected parameters (i.e. setting fire to everything), this lets him move around much more quickly.
Eggs and his time machine. Holy shit will that be handy on a timed mission like Caliborn's. I guess he still needs to be careful that he doesn't take out a planet before he gets there, but it's pretty handy.
Biscuits and his... oven. But maybe Caliborn will buy that shit about one second per second equalling time travel, so Biscuits won't be summarily culled for his uselessness. And when it comes down to it, he'd make a pretty handy meat shield too.
Quarters and his quarters improve Clover's versatility a lot, with that whole place-switching thing. I guess it's just one of those utilities.
Cans and the fact that he is just fucking epic. If Caliborn is any kind of not-a-complete-moron, he will pair Cans up with Eggs and use them to totally crush Yaldabaoth forever.