Mujina

A male Tanuki demon in disguise as a child who uses Shippo, attempting to get the power of Tessaiga, so that he may take over the world. It uses its sword, Dakki, in order to do this, and the blade was so weak that Inuyasha shattered it in one swing of his Tessaiga. Dakki eventually lead the InuYasha gang to Toshu.

When Shippo finds out Mujina isn't actually a girl, you can see he looks rather horrified, and possibly embarrassed. This leads us to believe he may have had feelings for 'her,' or possibly he was just ashamed for falling for Mujina's trick.

Mujina appears both in the anime (Final Act) and in the manga.

She appears in manga chapter 383.