Sol

Sol is a brown-and-tortoiseshell long-haired tom with pale yellow eyes.

Eclipse

 * In Eclipse, Sol is first seen on WindClan territory by Hollypaw. Hollypaw seems to think he is a lion and calls Sorreltail, but she thinks it's a WindClan cat. He seemed to be just standing there, watching the patrol. Later, Sol is found again, this time he is standing on the border, waiting for a patrol. The patrol brings him back to camp where he seems to say he has some news. He goes out into the forest with Jaypaw and Leafpool. Sol tells them that darkness is coming, eventually meaning the eclipse. Foxpaw and Icepaw eavesdrop on this conversation, and they swear that they won't tell anyone. The rogue, or as he likes to be called, traveler is taken back to camp and escorted to the WindClan border. Later, Jaypaw, Hollypaw, and Lionpaw come to find him. He is sheltering in an abandoned Twoleg nest, one they have never seen before. Jaypaw asks him about the prophecy, which he seems to know about. He agrees to go back to ThunderClan territory, where the three siblings can make him a little hut. He was to be their mentor on the prophecy. Before they were to go, a ShadowClan patrol captures them and takes them to ShadowClan camp. Sol seemed eager to go with them, and when they arrived he started asking Blackstar questions. Blackstar admitted that he was having second thoughts about living at the lake. Sol talks him into not believing in StarClan, saying they are a bunch of dead cats. Sol accompanies Blackstar to a gathering where they tell everyone that ShadowClan has given up on StarClan and won't be attending the gatherings from now on. Even though Sol is called a loner, he may as well be a rogue, as he has caused trouble in the Clans.

Long Shadows

 * Sol has pretty much taken over ShadowClan, even Blackstar has changed his name to Blackfoot. He is seen teaching ShadowClan to forget StarClan and find answers inside themselves by Jaypaw, Hollyleaf, and Lionblaze. But, with the help of Jaypaw, Lionblaze, Hollyleaf, Flamepaw, Tigerpaw, and Dawnpaw, and their fake sign from StarClan, ShadowClan drives Sol out. He shows up talking to Hollyleaf later, but she drives him away towards WindClan. It is unlikely that Sol has left for good, for when he talked with Hollyleaf he remarked, "You need me, Hollyleaf."

Sunrise
After discovering Ashfur is dead, many of ThunderClan believe that Sol killed him. A group of cats from ThunderClan are sent to find him, and find him living with, and sharing food with, Purdy. The ThunderClan cats take Sol back to the lake, where he is put under trail by Firestar, who fails to prove him guilty or innocent. Becuase of this, he is kept as a prisoner. Lionblaze helps him escape, after Sol promises he'll tell Lionblaze who his true father is. Sol hides in the abandoned Twoleg nest near the ShadowClan border. Jayfeather, Hollyleaf, and Lionblaze come to visit him, to learn what he has to say, but they learn that he just wants to use them to take over the other Clans. They tell him no, and he simply leaves.