Rei Riku, Gin no Guardian Wiki

Its possible that she has some relation or connection to "The Collector", due the exact resemblance between the two of them and the fact they share the same voice actress; possibly even being the same person.

Gin no Guardian, Isekai Wiki

Shūjin Riku - Wikipedia

Anime by BLADE

Riku Rei - Gin no Guardian - Zerochan Anime Image Board

List of series run in Weekly Shōnen Jump - Wikipedia

Suigin Riku, Gin no Guardian Wiki

Rei RIKU (Character) –

Bon Clay vs Sanji

Rei Riku, Gin no Guardian Wiki

Gin no Guardian (The Silver Guardian)