I took this photos a while ago so I can't go back and add anything for size reference now. Until I take new pics, I'll try to remember to add measurements.
Bartender Mix Kirby is 19 cm x 15.5 cm.
the7k - If you have any requests, please email me the sprites you want. sprites need to be in either .gif or .png format, never jpeg. if its part of a sprite set, open it in paint or something and remove all sprites you don't want to see and leave what you do. I can't promise I'll do fulfill every request I get, but I do promise that I will take them into consideration and evaluate if I can do it. As always, my email address is satoshimatrix@hotmail.com.
Here's some more.

The P-38 Lightening American fighter made famous from World War II and even more famous by the classic 80's Capcom arcade shooters, 1942 and 1943. I edited the colors slightly to better reflect what P-38's actually looked like. This sprite is fairly small, measuring 7 x 11 cm.

Auto is the assistant Dr. Light built to replace his former robotic assistant, Rock, whom was converted into the fighting robot Megaman to fight the forces of Dr. Wily and defend justice. Auto appears in a cameo in Megaman X3, making him the only canon classic series character to have survived into the 22nd century. However, this would make Auto over one hundred years old and many fans consider his presence non-canon by virtue of how silly it would be that minor character Auto outlived everyone else. Sprite is slightly color enhanced from Megaman 9. Auto is 11 cm x 12 cm.
And finally.......

The robot masters, called Star Droids, from Megaman V on the Gameboy.
From left to right, top to bottom:
Mercury, Venus, Neptune, Mars, Jupiter, Saturn, Uranus, Terra, and Pluto.
As the Gameboy was black and white and even with Super Gameboy Support, the spirtes lack any color, these sprites were painstakingly recolored by hand to reflect their original full-color artwork, making them appear as if they were enhanced NES sprites. As a bonus I've included the original sprites below just so you can see how many work needed to be done! [Side note: I changed Saturn's left arm slightly from another frame because I liked it better. Other than that, I made no changes.]
Megaman sprites generally range from 10 - 20 cm tall and anywhere from 10 - 20 cm across.