Innocent Sin Online

IMVU.com

On a chromebook?? Arcane Legends and AdventureQuest Worlds come to mind. The Play Store also has a few other neat MMOs I enjoyed like Stellacept Online. Zenonia 5 is also a solid one. Also Avabel. You're not going to get a lot of options for a glorified tablet.

Order and Chaos Online (The first one) was a personal favourite of mine for a while.

moshi monsters

Garfield kart

moshi monstersthat game was the shit, especially considering how easy it was to scam the membership system

Re:IMAGINE, or as I like to call it, SMT: IMAGINE Rewritten. Apparently some fans got together after Atlus shut down the Japanese IMAGINE servers, but I only know as much about the original game as I’ve read about on the Sesshou wiki.

Wait, that's a thing? Curious. Perhaps I should try it out.