Sorry for the late reply but here are the names~!
Anime - Miku Hatsune
Document - Miku Hatsune and Rin Kagamine
Download - Lily
Game - Miki
Images - Gumi
Music - IA
Project - SeeU
Software - I don't know >.<
Video - Rin Kagamine
Wallpaper - Luka
All of these characters are from "VOCALOID". Hope this helps. ^^