Several Vocaloids' voice providers appear in the Danganronpa series, examples include Otomachi Una = Himiko Yumeno, Haruno Sora = Kirumi Tojo and even Hatsune Miku = Seiko Kimura.
It's hard to find any popular seiyuu who voiced UTAU voicebanks, but there are two who appeared in Danganronpa. They're in the Windows 100% UTAU pack. Kujiloid (Kujira) voices Sakura Oogami and Kazusa Utanami (Kazusa Aranami) voices Kotoko Utsugi. You'll have to find the voicebanks yourself though, I ain't breaking the law!