Danbooru-based image board with a specialization in high-quality images.
blood kagamine_len kagamine_rin kaito kamui_gakupo poaro seifuku vocaloid

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rin and len with dark hair?!
Vocaloid is vocal synthesis software, it has no anime/manga, unless you count Black Rock Shooter.

Yamaha had a character made for each version, and make good use of their popularity. They recently had a Vocaloid Live concert.
Actually, if I'm not mistaken, these are fan-mades, based on Len and Rin. I would change the tags, but I can't remember their actual names at the moment. o.o;

*goes to do research!*