Randall Marijuana's Cat/C-Lightning
From Blaseball Wiki

Randy's Cat Cáfe is actually home to several cats, but Randy was too stoned to realize it. If you would like to see a list of all cats in the cáfe, or give a new cat a home in the Cáfe, click Randy's Cat Cáfe. This system is based on the Interdimensional Rumor Mill, which can be read all about at Interdimensional Rumor Mill.
Lightning
Lightning is an orange tabby adopted by Randall Marijuana as a kitten. Now a full grown cat Lightning is prone to wandering off for long periods of time, but always returns to Randall's side eventually, even if he's playing an away game. No one's really sure how that keeps happening.