Yūkimaru

Yuukimaru is a young boy (it is still unknown if he is a shinobi) who appears in the second Naruto Shippūden filler arc. Little is known about him yet. He seems to be a test subject of Orochimaru and has androgenous looks.

Hunt for the Three-Tails Arc
So far we have only seen him once in this arc, collecting tree flowers after Sasuke cut them off with his Chidori for his training.