I bought a transparent Pilot Kakuno EF fountain pen for my 10 year old.
The photos show a quick doodle I did to test it. It's loaded with Noodlers Black and the flow was perfect right out of the box. The nib isn't "smooth" -- it's very firm and has a distinct pencil like feedback which is even better.
He loves it... but there's a problem. I want to keep it!