I recommend these.
1. Baion Tow(倍音トウ)
a gentle, and soft voice
language : JP, KR
DL link : https://doubleeast.wixsite.com/utau/tow-en
2. Marune Shun'ichi(円音春二ノ前)
a strong, and vivid voice
language : JP, KR
DL link : https://www.youtube.com/user/ksh1807/videos?sort=dd&shelf_id=0&view=0
3...