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, Wiki

Rei RIKU (Character) –

Suigin Riku, Gin no Guardian Wiki

RIKU SUIGIN Fan Art - GIN NO GUARDIAN by drigogc on DeviantArt

Winter 2018 Anime, Seasonal Chart

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The Silver Guardian - Wikipedia

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The Silver Guardian Season 1 - Trakt

Enhanced Swordsmanship

Suigin Riku, Wiki