Would we be able to put in emojis into the comments, dhcp name, interface name, etc. It would be fun. 
No emojis. There is no UNICODE support at all (e.g. UTF-8 or UTF-16). RouterOS, essentially, uses single-byte code pages, specifically CP-1252.
See https://en.wikipedia.org/wiki/Windows-1252 for your options, mostly latin-based accents/etc. e.g. following add “€×××” as comment to ether1:
/interface/ethernet set [find default-name=ether1] comment="\80\D7\D7\D7"
And with this trick, the extended ASCII even then they only show up in winbox, as via CLI you’ll see just the hexstring code. Basically, only plain us-ascii only thing works everywhere.
Have you tried unicode ?
/interface/ethernet set [find default-name=ether1] comment="\01\F4\80"
/interface/ethernet set [find default-name=ether1] comment="\F0\9F\92\80"
Have tested my self and seeing thats not working 
You can use emojis in SSID, this is fun to have wifi named just 
/interface wifi set [find name="wlan1"] configuration.ssid="\F0\9F\A5\B0"
https://observablehq.com/@a2m0/utf2rsc#decodeStart
or
https://r-1.ch/mikrotik-unicode-ssid-generator.php