V2 Miku Got thrown away when Master bought a new model. She's broken because she was treated carelessly. She met the professor when she was thrown away and now she lives with the professor and the other Mikus. They're currently looking for a replacement for her left eye.

V3 Miku Loves V2-oneesama. Loves dressing up but the other two aren't really interested so she loves dressing up V2 instead. She's a little hostile towards NT because "how dare she bully Oneesama..."

V4X Miku The liveliest of the group. Part of her vocal adjustment function is broken so when she gets too excited, her voice starts roaring. She's always smiling and being the person who livens up the team. Unexpectedly gets along well with Append Miku.

Append Miku Bad at expressing herself through voice and appearance. She was bought by the professor at a secondhand bargain sale. A complete airhead. She's the oldest in the group but she acts childlike so everyone dotes on her like she's the youngest one.

NT Miku Very possessive. She thought, "Master is mine alone," so she viewed V2 as a rival and fiercely opposed her. Currently doing some self reflecting after she was saved when she herself was thrown out. Afterwards, she started looking up to her big sister just like V3 does.