|Living:||'Twilight, Sunset, The Sight, Dark River, Outcast, Eclipse, Long Shadows, Sunrise, The Fourth Apprentice, Fading Echoes, Night Whispers, Sign of the Moon'|
Mousewhisker is a gray and white tom with thick fur and green eyes.
- Mousewhisker first appears as a young kit. It is revealed that Hazel, Berry, and Mouse are Daisy's kits.
Berry, Hazel, Mouse, and their mother, Daisy, are found wandering around ThunderClan territory by a ThunderClan patrol consisting of Brackenfur, Spiderleg, Cloudtail, and Squirrelflight. The four loners are taken to the ThunderClan camp. After Daisy introduces herself and her kits to ThunderClan, Firestar, ThunderClan's leader, tells her that she and her kits can stay in ThunderClan as long as they like. After this, her kits are given Clan names: Berry becomes Berrykit, Hazel becomes Hazelkit, and Mouse becomes Mousekit. During the badger attack, Daisy and her kits are forced to evacuate the nursery and hide in the brambles above the hollow while the battle is fought below.