Here are sum cute scrapped ideas I had when trying to come up w an ao3 pseud
Boxfullofsnails
mochamars
teamuffinns
walwuss
melonpansexual
Beesus (like Jesus, but bees)
kiweewee (like wee wee, but kiwi) reply
I personally have a unique username, but it really depends on what kind of feel you want it to give off. 'Aeso' originated by a mis-click but I learned to love it. Another option could be, one that uses an object or place (idk you could say noun here, but you get where I'm coming from) You would want to add something different to the beginning or e...... reply
Well I just did it in the spurr of the moment, I took my favourite webtoon (Dr. Frost) and I just named myself web.frosty (web = webtoon and frosty = frost). Hope it helped (●'◡'●)ノ reply