Oh anon, let me smooch your darling face!
We know the only ship that really matters is between Caesar and Science.
Like mostly everybody else I ship Six and Holiday! They are just so perfect for each other and I'm forever frustrated when they were so close to finally getting that kiss but noooooo little sister has be all cock blocker.
I ship Cricket and Rex as well!! I like to think that before his mind wipe, Rex did realize that Cricket was in love with him. But even as an asshole he didn't want to hurt her in that way so he ignored it and feigned not to know. And after he came back did he start having feelings for her!
I don't ship Rex and Circe. I think they do care for each other but just didn't work out and realized they weren't really meant for each other romantically.
Then he got with with Cricket!
Contrary to my headcanon that Caesar is possibly asexual and maybe aromatic my guilty ship is Black Knight and Caesar. It's twisted in a safe word but mentally manipulative sort of way.
Sometimes I ship Holiday and Caesar but it's one of those fleeting ships that come and go.