Name: Shi [Japanese for Death]
Age: Unborn
Looks: Shi, when living, had been a black kitten with yellow-green eyes. When he died, his spirit took on the appearance of a black, shadow-like kitten with unnerving yellow eyes.
Personality: Shi is playful and mischievous, and likes following Jane around like a shadow. He can be very malicious if something is threatening Jane, and strongly dislikes Jenny and Koda.
Role: Deceased Male Kit
Mention: @Lefty the bear
Other/Questions?: Since Shi had been born as a rogue kit, and had never known of StarClan or the Dark Forest, he lingers around the living world as a spirit that only Jane can see. (If he really wanted to, others could see him but it's very rare that he'd reveal himself.)

Do you mind that Shi will be following Jane around like an imaginary friend/ghost?

He'll have to be an imaginary friend of sorts that Jane came up with since ghosts aren't allowed ;-;