Bun-E03 was always intended to be a general mascot and representation of my art as a whole, so even when I was designing an avatar that would eventually become The Monitor, I knew Bun-E03 still needed to be a part of streams. That resulted in the earliest versions of Chibun-E03, who's had a few versions (though the current one is in layers, making expressions and outfit swaps easy to automate).
The kayfabe and themeing of the streams and Superfuture Technolabs followed pretty quickly after that to the point that Bun-E03 shows up a lot more than my own avatar currently. People like the bunny. I like the bunny. Everybody wins!