Aiko got used on Nico!! Nipek, a user who’s made several UTAU originals (including ones for Buttnose and Murasaki Mai) used Aiko in an original rock-style song, “Towards the Dream”.
Also, I uploaded a couple of covers of Cookie Clicker related songs recently. Yue helped render Kujiloid vocals for me on “I Keep On Baking Cookies” and I did an English cover of bethco’s Defoko original, “Cookie Clicker”. I have no shame.