Mud

Mud is a brown tom with darker paws, a white chest and underbelly, and yellow eyes.

Moonlit Generations
Mud is an antagonist who is leader of the Shadow after killing Sear, renaming his Group to “Mud’s Cats”. He is notably warmer towards Ratfang, his deputy, and does not want to harm him unlike the rest of his Group.

Outcasted
Mud does not appear though is mentioned by Ratfang to have been plotting to kill Sear for exiling Ratfang and because of his own ambitions on ruling the Shadows.

MudXNight
Mud first appears on a floating tub that's drifting downstream, sitting on the opposite side of Nightbreeze, a Moor Cat.

You’ll Never Be Alone
Mud saves Jackdaw from falling out a tree, holding him by his tail. He is a rogue and mentions he tried finding shelter with the River Cats though Frostleaf instantly rejected him for his origins, thus angering him.

The Moor
It is revealed Mud has been accepted into the Moor by Thistlefang as he was previously a rogue who seeked a home. Brightclaw introduces him to Swift, though he is very cold and uncaring, even getting angered at Swift for her constant remarks.

Trivia

 * Mud has been in a member of almost every group: the Pine, Shadow and Moor, and was close enough to joining the River before being chased out.
 * Mud never loved Ratfang and only saw him as a close friend he could rely on until the day he dies.