The Rogue Shinobi

Outside the village of Konoha a rogue shinobi gives a pair of Jounin a challenge.
This rogue is considered a threat to the village by all, aside from the Hokage.
In his decision making, he forces this rogue to join his village, as a Genin.
This rogue does not argue or make a fuss upon hearing this decision.
Why did the rogue join the village so easily?
Where did they come from?
What are their true intentions?
Did the Hokage make the right decision?

A Naruto OC Fan-fiction.