Kiriness comes from my love of the Kirin, a creature from Japanese mythology. I just decided to add -ess at the end to make it sound more feminine (such as "lioness"), I guess?
Sunset Shimmer is my favorite of all time. I'm a sucker for redeemed characters. Plus, I admire her leadership. ^^
Romans go home
Oh geez, I don't have a favorite! That being said, I do like "Si vis pacem, para bellum." (If you wish for peace, prepare for war)
Hmm...There are so many! I also don't have a specific favorite, but I like "nox" (night), "aegis" (shield), and "incensus" (burned/inflamed).