Yay! This forums has a Kiyoteru FC too just like VocaloidOtaku did! <3
I love Kiyoteru for such a long time now =^^= When he was released people were always mentioning him as some kind of perverted and accusing him of being a copy of Kaito. I didn't know much at that time but then someone released
a cover of Magnet using both Kaito and Kiyoteru so I was like "Hey, they don't sound similar at all". I tried paying attention to more and more of his voice traits and I think there's some melancholic tone in his voice that no other Vocaloid have. And it's so pretty, I love it so much. I don't think his V4 voicebanks have this melancholic tone anymore (I got kinda depressed for them not having it so apparent as his V2 does). But now I got used to them (although V2 still is my favorite voicebank).
As of now the only merch I got of him is his V2 voicebank box and his Koko ni Kimi ga Inai Nara book which I hold it very dearly. <3 I wish I can have his releasing magazine someday too but I don't think I can grab it so soon. If it does appear online someday it probably won't be that so cheap ;-;
I can't choose a single favorite song of him, I guess I could count
Human Error (Applem1nt's cover),
Hey William (Rylitah's cover),
Inokori Sensei (OrlyPep's cover) and
Love is War Remix (Sango's Cover). <3
And my favorite fanart ever I met on Zero-chan. I could never find it on Pixiv (I'm almost sure it comes from there, but when I first began looking for Kiyoteru pictures was on Zero-chan). This one:
Hiyama Kiyoteru - VOCALOID - Image #754682 - Zerochan Anime Image Board
And that's it. I think I answered all the questions of the topic. X3