mister positive
A nickname that means the target mentioned always says or do positive things/always optimistic.
-Hey Mister Positive! We don't have money, You got something positive to say about that?
mister positivity
You know me; I can't complain.
"OMG, she broke up with me because of the Rona. But Mister Positivity is still out there, swinging. Too bad the bars are closed."