Chacha is an MSA Android who intends to use the Nano List technology to subjugate humans. Chacha enjoys a position of influence at MSA and employs other Androids to help realise her schemes. According to Dr. Ahn she is under the protection of the head of MSA.
Her elegant appearance and cheerful disposition masks her ruthless personality. She exhibits an extreme inferiority complex towards humans, such as Maddie Ahn and the MSA CEO. She showed a degree of companionship with Maddie, however, as she may have been the only human Chacha acknowledged. She can be singleminded in her goals, such as when she wanted to take Milo at all cost, despite the damage being done to herself.
She admired Dr. Maddie Ahn and shared a camaraderie with her during their collaborations but attempted to hack the research behind the doctor's back. After getting caught and rebuffed by Dr. Ahn, she resorted to coercion which ultimately failed.