Kurumin is the online alias of Dot, a character who maintains a secret identity as a popular video streamer by broadcasting in a distinctive costume. This persona projects an energetic and enthusiastic personality, delivering Pokémon-related advice and content. In reality, Dot serves as the programmer for the Rising Volt Tacklers group. She begins as reserved and withdrawn, preferring to stay in her room focused on content creation rather than socializing or outdoor activities. Her partner Pokémon is Quaxly, which evolves into Quaxwell and later Quaquaval.

Dot gradually becomes more involved with the main protagonists Liko and Roy, marking significant character development. She leaves her self-imposed isolation to join their journey, enrolling alongside them at Naranja Academy in the Paldea region to study the Terastal phenomenon. This shift demonstrates her growing connection to the group and increased participation in their adventures. Over time, she opens up more to her teammates, forming a particular bond with Liko, and becomes more integrated into the group's activities.

During the Mega Voltage arc, Dot aids the Rising Volt Tacklers' efforts to clear their name after they are framed for an incident. Her technical skills and her online platform as Nidothing contribute to the group's missions. The contrast between her reserved in-person nature and her expressive online identity remains a consistent aspect of her character throughout her appearances.