Marin, known as Baby Kitty or Kitty, is a young kitten and the romantic interest of Baby Felix. She aspires to emulate the famous Kitty Kat. Marin is close friends with Mimi, and the pair are frequently seen together in various activities and adventures. Her personality includes a strong sense of curiosity, which once led her to mistake a small green forest glow for a fairy during a camping trip; this prompted a group search that resulted in everyone getting lost. She reciprocates Baby Felix's romantic affection, receiving gestures like blown kisses. Marin actively participates in group outings, such as camping excursions with Baby Felix and his friends, contributing to their shared experiences.