Aibo

Name: AI-Ball
Sex: Female (According to Settings)
Age: 5 (AI) | 6 (AINS-AINI Past) | 12 (AINI Present)
Birthday: November 9
Profession: Investigator Assistant
Likes: Insects, Spiders, Crustaceans, 1010000011110101/A0F5, 5301B63F
Dislikes: Dirty jokes, Going outside the simulation, Watermelon crushing VR videos, Passing "I Am Not A Robot" Tests on Websites
Hobbies: Sneaks outside of Date's eye socket while he's sleeping and makes mischief, Dancing, Watching Ants, Sympathizing With Salmon
Skills: Hacking, Fluoroscopy, Voice Imitation, 3D Modeling

An autonomous artificial intelligence called an "Al-Ball" which usually takes the shape of an eyeball.

In AI: THE SOMNIUM FILES:
She resides in Date's left eye socket. She assists Date by gathering information, connecting to networks and databases, and using her X-ray and thermographic functions.

In No Sleep For Kaname Date – From AI: THE SOMNIUM FILES:
Recently, she has found enjoyment in chatting with Mizuki behind Date's back.

In AI: THE SOMNIUM FILES - nirvanA Initiative:

She got into a fight with her current partner Date and is now on her own. She is doing a top secret mission ordered by Boss.

She assists Mizuki with her investigation. Does not remember anything from the case 6 years ago.

Spoiler

Her top secret mission in AI: THE SOMNIUM FILES - nirvanA Initiative (Past) involves assisting Bibi in her investigations into the Half-Body Serial Killings.