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Juniperclaw! He is Dawnpelt's and Crowfrost's son, sibling to Sleekwhisker and Strikestone. He is part of the unruly apprentices in the Vision of Shadows arc, and leaves with Sleekpaw and Needlepaw to join the Kin early. He does a lot of stuff in the arc, but rejoins Shadowclan and then Skyclan, and notably becomes Tigerstar's Deputy when the leader returns and sepparates Shadowclan out again. Juniper is really excited to see Sleekwhisker when she returns with Yarrowleaf, and helps the two she cats when they are rejected by Leafstar by keeping them hidden in the old Shadowclan camp and hunting for them. He helps plan the attacks on Skyclan to try to drive them out and get revenge, and is later revealed to have poisoned the clan's fresh kill with death berry seeds nearly killing cats. He is removed from his position and put under guard, but escapes to find Shadowkit when he goes missing and the clan is distracted. he gives his life to save Shadowkit. He is characterized in my mind as an extremist with a heart of gold, and its no wonder the fandom likes him so much.
he later is part of the cats overshadowed by Ashfur, and once the imposter is defeated he tries to ascend to Starclan but is rejected. as a compromise he offers to guard the bridge between the afterlives, to prevent another cat from taking advantage of it in the same way again.