Idealist

a person who cherishes or pursues high or noble principles, purposes, goals, etc.

a visionary or impractical person.

a person who represents things as they might or should be rather than as they are.

a writer or artist who treats subjects imaginatively.

a person who accepts the doctrines of idealism.

idealistic.

noun

pragmatist , realist

noun

dreamer , enthusiast , escapist , optimist , platonist , radical , romancer , romantic , romanticist , seer , stargazer , theorizer , transcendentalist , utopian , visionary