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.

Rei Riku from The Silver Guardian

Gin no Guardian – 01 – Random Curiosity

Gin no Guardian Review..

Gin no Guardian Wiki

Suigin Riku, Gin no Guardian Wiki

Rei RIKU (Character) –

Rei Riku from The Silver Guardian

Riku (Kingdom Hearts) - Wikipedia

Gin no Guardian (The Silver Guardian)