Umika is the most carefree of the Lupinrangers. She uses a lot of playful and casual speech even when in action, although she can get fed up with the other members. Mainly with Kairi, since he always leaves while she and Touma do their jobs at Bistro Jurer.
She develops a close and friendly relationship with Tsukasa in her civilian form. She also unexpectedly develops a friendship with Sakuya, although in chagrin since he harbours a crush on her. 
She has a best friend called Shiho Ichinose.