Most Underused Vocaloids

Some Vocaloids aren't used enough for songs. Some people feel that they should be used in more songs. Tell me who you think is the most underused.
The Top Ten
1 Kamui Gakupo

I can easily count the number of Gakupo originals on one hand. For one of the "Main Eight", he's barely used for anything other than covers.

2 Ryuto Ryuto is a male Vocaloid created by Internet Co., Ltd. He is the mascot of Gachapoid. Despite not being a failure, he generally has negative reception. He is voiced by Kuniko Amemiya.
3 Flower
4 Otomachi Una Otomachi Una, sometimes referred to as Una Otomachi, is a female Vocaloid created by Internet Co., Ltd and MTK Inc. She is voiced by Aimi Tanaka.

Have you seen bring it on by her!?!?!

5 CUL
6 Yuzuki Yukari
7 Nekomura Iroha
8 Kaai Yuki
9 Lily Lily (リリィ) is a female Vocaloid created by Internet Co., Ltd., done in collaboration with Avex Management Co., Ltd and YAMAHA Corporation, and was initially released in August 2010 for the VOCALOID2 engine. There has since been a second installment developed for the VOCALOID3 engine and dubbed V3 Lily. She is voiced by the Japanese female singer, musician and performance artist, Yuri Masuda (益田祐里; Masuda Yuri).
10 Kokone Kokone (心響), whose name means "Heart Sound" in Japanese, is a Vocaloid 3 vocal released by Internet Co., Ltd..
The Contenders
11 Hiyama Kiyoteru
12 Chika
13 Xin Hua
14 Kizuna Akari
15 Fukase Fukase, is a vocal developed and distributed by Yamaha Corporation for Vocaloid 4. He is voiced by Satoshi Fukase, the lead singer of the Japanese band, SEKAI NO OWARI.
16 Tohoku Zunko Tohoku Zunko is a character created for Voiceroid and was later also developed for the Vocaloid 3 engine.
17 YOHIOloid Yohioloid is an English Vocaloid developed by PowerFX who also has an additional Japanese voice bank. The vocalist sampled for his vocals was Swedish singer Yohio.
18 Luo Tianyi
19 IA (Vocaloid) IA is a humanoid persona voiced by a singing synthesizer application developed by 1st Place Co., Ltd., headquartered in Meguro, Japan. They use Yamaha Corporation's Vocaloid 3 singing synthesizer technology. Her voice is sampled by Lia.
20 Kagamine Len

Lies

21 Aoki Lapis
22 Utatane Piko Utatane Piko is a Japanese speaking Vocaloid by Sony Entertainment for Vocaloid 2. He is based on the Japanese singer Piko.
23 ARSloid Arsloid, is a Vocaloid 4 vocal synthesizer. The sampled voice was Kano Akira, a member of the Japanese odorite group Arsmagna.
24 OLIVER
25 Clara
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