Shellstar

Shellstar is the former leader of RiverClan. He is described as a mottled light brown tom with green eyes.

Shellstar was born to a she-cat named Frostwing. He was mentored by a RiverClan she-cat named Mallowfrost. His warrior name was Shellheart. Shellstar was a mentor to both Redwhisker and Snowleap.

Shellstar was an avid supporter of Lionclaw, and believed he would become a joint leader of DarkClan, Lionclaw's brainchild. Once Lionclaw enacted the battle between the DarkClan supporters and the Clan cats, he was indeed made a joint leader, alongside Briarstar and Lionclaw.

Shellstar was quick to act and often blundered into situations that were detrimental to both himself and his Clan. Before DarkClan was created, he hoped to remove Littlestar from power, believing Lionclaw to favor his own leader over the fanatically loyal mottled brown tom. He attacked the ThunderClan camp with several of his DarkClan supporters, severely injuring Wetnose and killing Dewfoot. During the last Gathering, the other Clan leaders (excluding Briarstar) called for Shellstar's removal from power, claiming he was hungry for battle and that the blood of innocent cats would be spilled unecessarily if he continued to lead. Angry and nettled, Shellstar and his warriors returned to the RiverClan camp. Shellstar fled from RiverClan after an argument with his deputy, Gorsepelt, believing no other cat supported him and his desire to help DarkClan come to be. He became a loner, visiting Lionclaw and Briarstar during the night to continue planning. After DarkClan was created, he became a joint leader, but his bid for power did not last long. He was defeated by Tallstar, who destroyed DarkClan's foundation and returned the Clans back to normal.

After the final battle, and after Lionclaw was killed, he named Gorsestar as leader, before fleeing into the forest. He presumably died of old age. He was seen in the Place with No Stars alongside Lionclaw after his death.