Who is valiant?

My answer: Superman

^Does that also work?

Yes, but I'm sure you can find a much better example.

"val·iant
ˈvalyənt/Submit
adjective
possessing or showing courage or determination.
"she made a valiant effort to hold her anger in check"
synonyms: brave, courageous, valorous, intrepid, heroic, gallant, lionhearted, bold, fearless, daring, audacious; More"

-- Google