Mandolin?

I find this drawing very unique. The teaming of Nightmare Moon and Lord Death is unusual yet well placed. The way you transfer from Soul Eater to My Little Pony also is well put together. I'm rather fond of how you added the characters' attitude into the image, Lord Death's amusing quirkiness and Nightmare Moon's sly deviousness.
Lord Death paired with the sun on his side of the drawing makes me feel as if he is a happy-go-lucky kind of character, this emphasized by his "you got this," pose. While Nightmare Moon, paired with the moon, gives me more of a "Try it, I dare ya," kinda feeling.
The styles you used to draw and color the characters shows me that you were very committed to your work and were very careful to get the whole drawing set just right, having said this I must add that whole picture is truly amazing, while the background could have had some more detail added to it.
More specifically the crosses behind Lord Death are too controlled and the sun and moon look kind of like stickers on a poster. Besides those little things though I truly enjoyed this drawing, both on the levels of an otaku and a brony.