Oh neat! It's really cool that you're doing this for everyone.
Stardust would be the obvious choice. But let's make it interesting and make it his energy form.
It's the middle guy if you can't tell.
I don't have an instragram, so just credit it to my tapas.
If you don't feel like doing a take on a public domain character, you can draw a Kellyman from Capeworld Secret Files which takes place in the same setting as The Power of Stardust.