This is really just for fun, but I personally like the ability to enable the "sketch" style under the draw.io editor in Confluence. I use it extensively as it makes the notes a little bit more fun to read. I noticed that the draw.io editor in Aha! enables a "comic" option but it is not nearly as nice as the "sketch" style enabled on Confluence. This is a detail but it'd be nice to have a few more options in draw.io.
I was going to add an idea and found this one. I would ask that you support this style similar to Balsamiq.