MSPAO is a Danganronpa Online-based server, which is located on Attorney Online, a roleplaying chatroom that has a ton of neat functions!
You can choose a character and use their sprites to talk with other people. Many kinds of activities are welcome! It is not limited to roleplay either: you can host games, have casual chats, etc.
The characters you can embody range from Official Homestuck media (Pesterquest/Hiveswap Friendsim) to fancontent (Snowbound Blood, Fansims, etc). You wanna use your own fantroll? Don’t worry! If you have sprites for them, importing to the client is super easy too!
Here's how it looks:
There's also tons of music and backgrounds to choose from! You can join the discord or read the tutorials if you'd like to know more.
More information: https://tinyurl.com/MSPAOmenu
Tutorials. A bit outdated, but still serve as a good guide.