He was against the Iraq war. Helped with shenanigans against the establishment at the 2016 convention. That said he's subject to the One Good Shot rule and will likely be compromised in some way.
No ActBlue on his donation page so that's something.
https://en.m.wikipedia.org/wiki/Dennis_Kucinich
He wanted to impeach Dick Cheney for his shenanigans and 
for invading Libya. He ran for president in 2008 supporting single payer. He was a Bernie supporter. Regular thorn in the establishment's side. Protected a public utility from being sold in Cleveland
He has warnings about the WHO on his issues page and recently a campaign manager for RFK Jr.
I found a YouTube link in your post. Here are links to the same video on alternative frontends that protect your privacy: