In November and December 2017, I ran an online robot named "Twitchy". He was live-streamed on the Twitch.tv live streaming service. He's controlled by text commands in chat, and would be left on my hobby table with toys like Lego, Blocks, and paints. He was a lot of fun.
I would love to bring him back, but in doing so I believe he needs to have purpose beyond just being an arm on a table. He needs to be able to do something. Something that brings lasting fun, something that makes it easy to let him just play 24/7. To start I'm making an interactive environment, something fun to play in and allows for players to explore and do something with the arm.
In my toolbox I have a Linux computer with a decent graphics card, Unity 3D, Arduino, and a 3D printer. At the time of creating the project on this site. I have 3D printed my first few parts, and have defined the environment size and space and written some code in Unity3D.