Note: This is not time critical or anything, Just something for the future once things calm down a little.
we've already got people posting gifs of dancing animu girls that take up your entire screen. Do not want. If they were limited in size to like 64x64px or something, or opt in, that'd be fine. I do not like having the giant images just pop up and break up the flow of comments.
You may now struggle in the session.
Wait this isn't struggly enough.
Anime is revisionist! 
I like them, but I wish they were opt-in. Show a thumbnail that's the same size as the other emotes, click it to expand the whole image - something like that. As it is if they catch on and everyone starts using them all the time I could see that being a big drain on bandwidth and that's not something I want to worry about on this site.