I like this as a funny meme category

You can if your time is not a WR time, as WR times need to be submitted through video. To submit a picture, upload the image to Imgur (www.imgur.com/upload) and then once you do so, you'll be redirected to the uploaded image on Imgur. Copy the URL you see when you get redirected to this and paste it into the "Video Link" box.

By the way, does anyone know when the leaderboards will be up?

Yeah, TurtleSpeed is right. It's not like, say, Mario Odyssey where minimum captures is separate from Any%

I think it'd be best to do it the way Star Allies' Ultimate Choice or ??? Guest Star Allies has it, where it also shows what character was used.

I know it’s 8 months late but I agree with this. I have a 4:04 run from a while back that I’d love to submit and I was frankly surprised to see that there wasn’t a Helper to Hero leaderboard.