Based on the word "emoji" this domain name has clear connotations to the online and social media world.
The name "EmojiU" has only six letters and four syllables. Four syllable names are used by established brands like Unilever, Panasonic and Coca-Cola.
Emojiu.com is a .com domain. Dot com domains are the most valuable top-level-domain in the world, famously used by websites like youtube.com. Once you own a .com, it will be much easier to rank for your own name in Google.