Well, one possibility could be that Naruto, influenced by Kurama's knowledge or some strange magic, starts to admire Deathstroke's combat skills. So he might try to incorporate some of Deathstroke's fighting tactics into his own ninja style. For example, Deathstroke is known for his precise and calculated strikes, which Naruto could adapt to his Rasengan attacks to make them more effective.
The 'Deathstroke: Rebirth' series is also great. It delves deeper into his backstory, his family relationships, especially his relationship with his son. His skills as a mercenary are also highlighted in a very engaging way throughout this story. There are intense fight scenes and moral dilemmas that make it a top Deathstroke story.
Deathstroke's age in the comics is a bit fluid. It often depends on the creative direction of the story. Usually, he's thought to be in his mid-40s to early 50s.
He may also try to talk his way out. Nightwing is known for his charm and intelligence. He could try to reason with Slade, find some common ground, or play on Slade's emotions. Maybe he could remind Slade of a past event where they had a moment of mutual respect, hoping to make Slade let him go.
One possible motive could be revenge. Maybe Nightwing has thwarted Slade's plans in the past, and Slade wants to get back at him. Another could be that Slade sees Nightwing as a valuable asset. He might plan to use Nightwing's skills for his own evil purposes, like forcing him to steal something or gather information for him.
Kurama might be the link that brings Naruto into Deathstroke's orbit. Since Kurama is such a powerful and unique entity in Naruto's world, his presence could be what makes Naruto aware of Deathstroke in the first place. For example, Kurama could sense some strange energy similar to Deathstroke's and draw Naruto's attention to it.
In comics, Deathstroke is typically shown as a cunning and powerful adversary for Superman. Superman, on the other hand, embodies moral righteousness and superhuman abilities. The clashes between them make for exciting storylines.