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Santana? Carlos Santana? He has done good collaborations with other artists. (Though, i'm not fond of 'Into the Night' with Chad Kroeger. It's not Carlos, it's Chad. xD) Maybe a great song with Hikki could be possible. But every time I think of Santana, I always think of his earlier works rather than the collaborations.

Well, since m-flo was already suggested, I thought about another hip-hop group. How about Epik High? They collab with female vocals wonderfully. I swear, Epik High + female vocalists is like peanut butter and jelly. (ex. Fly, I Remember, Paris, One, 1 bun, 1 cho, Umbrella, Love Love Love)

Even though they're a Korean group, there is still a possibility they could mesh well. I'm not sure how well does Mithra grasps English, but Tablo is fluent. He's an great lyricist for that matter. And besides, they have already collaborated with a Japanese artist previously, Emi Hinouchi. Music wise, Epik High's music is more downtempo and darker than Hikki's music. But I really think they would go well together.