Utopian

nouns

an idealistic (but usually impractical) social reformer
"a Utopian believes in the ultimate perfectibility of man"
Utopian
is derived from
utopian
is a type of (narrower)
a disputant who advocates reform
crusader, meliorist, reformer, reformist, social reformer

adjectives

of or pertaining to or resembling a utopia
"a Utopian novel"
Utopian, utopian
is derived from
Utopia
pertains to
Utopia