Wiktionary
n. (context Ulster English) unpredictable individual
Usage examples of "right one".
But when Ziyal appeared, Seven knew that she had found the right one.
And he held her close, and she knew that whatever trials lay ahead of them, she would face them at his side, unafraid and filled with a sense of determination that came of knowing, without the faintest scintilla of a doubt, that the path she had chosen was the right one, the one she had been born to follow.
Brother Anselm looked round cautiously for his cudgel, but it was out of reach, Brother Louis kept both hands in sight, as ordered, but the right one very near the slit seam of his gown, beneath which he kept his dagger.
Yevir said, smiling at the attendant, sure now mat his decision to travel to the station was me right one.
I made a judgment call, and with what we knew, I thought it was the right one.
You are of such tender years to rule Kundala, but if I am any judge, you are the right one to rule.
He hasn't given a thought to naming his four-legged companion, because he's known that eventually, when he bonds better with the animal, he'll arrive at not just any name, but at the exactly right one.
Roger picked through his keys again and put the right one in the lock of Riddley's cubby.