Hi there! You can change the hue of the sprite using Edit > Adjust Hue/Saturation:
In case that you are on an indexed sprite, the command will change the color palette too. If you want to avoid that, you have to select first a part of the sprite (e.g. all pixels in the active layer with Ctrl+A) with the marquee tool (but in this case, for indexed images, the hue/saturation adjustment will try to use the current color palette, instead of modifying it, which might not be optimal).
I hope something of this makes sense, basically the Adjust Hue/Saturation works differently depending on what is selected (nothing, pixels, or color entries).