I’m studying Japanese and would like to surround myself with the language as much as possible.
Surely there must be vocal covers of obvious stuff like FF, Chrono, Castlevania and Mega Man (http://www.youtube.com/watch?v=Lsj0mY13t9s)?
Other than that, you might also like to try the original Japanese version of Melodies of Life from FFIX sung by Emiko Shiratori (although the US/European version of the game had English lyrics). The original Japanese recording however is available on the Japanese FFIX OST and also on the US FF S Generation CD album released by Tokyopop.
Hopefully this has helped. 🙂
Wish from Shenmue
Lost in Thoughts All Alone from Fire Emblem: Fates
Kokoro no Kakera
Katamaresort Song from Katamri Forever
White Night Imagination from Atelier Iris: Eternal Mana