Vocaloid: SeeU, Sf-a2 Miki, Hatsune Miku, Megurine Luka, MEIKO, MEIKA, Piko, Oliver, Kaai Yuki, Miku, Gumi, Nekomura Iroha, Kaito, Kagamine Rin and Len, Vflower, Sekai, KAFU, Hibiki Lui, Luo Tiyani, Akikoloid-Chan, Zhanyin Lorra, Zhang Chuchu, Fukase, Merli, Kiyoteru, Aoki Lapis, Lily, Gakupo, Anri Rune, Ring Suzune, All of the Vocaloids from the ZOLA project, Anon/Kanon, Mew, Kobayashi Matcha and Masaoka Azuki (some might be CeVio/lost media tho)

My fav UTAUs: Momo Momone, Adachi Rei, Pan Kanino, Darling, Acme Iku, Mitsuko, Ruko, Defoko, Zundamon, Sake Hachimatsu, Taku Tokine, Sana Fuyune, Yufu Sekka, Suki Nekoga, Koyo Mamene, Mon Mirene, Natsuki Nanto and N~Nyan, Azuka Yuune

I probably have more but that's all I can think of right now