Answer:

optimist

Answer	Crossword Clue
OPTIMIST	Rose-colored glasses wearer
OPTIMIST	Wearer of rose-colored glasses
OPTIMIST	Sunny side seer

OPTIMIST	Dr. Pangloss, for one
OPTIMIST	Murphy, per O'Toole
OPTIMIST	One with a positive outlook
OPTIMIST	Dr. Pangloss, for example.
OPTIMIST	Owner of a hope chest.
OPTIMIST	Positive thinker.
OPTIMIST	One with rose-colored glasses
OPTIMIST	One with high hopes

OPTIMIST	Sanguine one
OPTIMIST	His glass is half full
OPTIMIST	"A guy that has never had much experience": Don Marquis
OPTIMIST	Bastille "How am I gonna be an ... about this?"
OPTIMIST	One perpetually full of hope
OPTIMIST	Prisoner of hope
OPTIMIST	Hopeful soul
OPTIMIST	Glass-half-full person

OPTIMIST	Voltaire's Dr. Pangloss, e.g.