>What do the mods think about it?
I dunno about kaguya, but my personal opinion is that using them in a "I am emulating nu-4chan/Twitter behavior on purpose because I know it annoys Heyuri users" way = B&, but I don't have an problem with emoji inherently - I've used them myself (in conjunction with kaomoji and AA) on Heyuri in teh past!

I'll add that staunch "anti-emoji-ism" is equally annoying and Rule 8-like - nobody gave a crap about the rampant emoticon/emote/smiley usage on forums and IM back in the day!

In fact, one idea I've had for a long time is either making our own emoji font (proved too difficult for me...) or wordfiltering them to classic Japanese phone emoji icons, such as: https://emojipedia.org/softbank/2004/