Found a whole folder of unused voices in JoJo's Bizarre Adventure: Eyes of Heaven for Part 6 (Stone Ocean) Jotaro who isn't actually in the game aside from an image in the credits. I compiled all of them together, made icons to go with them, and included both Japanese ( Romaji) and English subtitles. He interacts with Jonathan, Joseph, Kakyoin, Avdol, Polnareff, Iggy, Old Joseph, DIO, N'Doul, Josuke, Koichi, Okuyasu, Rohan, Yukako, Akira, Kira, Kosaku, Giorno, Jolyne, Ermes, Anasui, and Pucci.
Thanks MetallicKaiser and Eas for helping me out with a few translations. Also thanks to Simpsonill for some of his music I used as BGM.
--- ジョジョの奇妙な冒険 Part6 - 空条 承太郎 - 未使用のコンテンツ --- Music used: Stardust Crusaders (Simpsonill remix)  Stardust Crusaders Theme Mashup by Tsunscreen  Stand Proud (Simpsonill remix)  Decisive Battle (Simpsonill remix)  Jotaro Vs Kira (Simpsonill)  Theme of Jotaro Kujo - Heritage for the Future Stardust (Simpsonill)  The Fate Which Still Remains (Part 4 Anime) Hesitation (Part 3 Anime) Jotaro Kujo Battle BGM  Heritage for the Future (All Star Battle) Part 4 Jotaro Kujo Battle BGM  2 story mode tracks from EoH