optimist
//ˈɒptɪmɪst//
Noun
optimistSingular
optimistsPlural
1
A person who tends to be hopeful and confident about the future or the success of something.
She is an optimist who always believes things will work out.
2
A person who believes that good ultimately predominates over evil in the world.
She is an optimist who believes that good will always triumph over evil.