Heres a challenge that I really haven't seen for this kind of crossover. This takes place in the same universe as Young Justice so it has to be that Robin before he becomes Nightwing.
Summary: After getting in a huge argument with Batman and even his team, Robin decides to call it quits and leaves. On his way across the country, he runs into some trouble(Be creative with it and believable). Robin gets some unlikely help from an old man with strange whisker like marks on his cheeks. The old man is named Naruto Uzumaki. Robin reminds Naruto of himself when he was younger, hot tempered and all. He also sees the enormous potential the boy possesses so he decides to take him on as his apprentice. Naruto trains Robin on how to use Chakra and trains him like a Shinobi. Robin disagrees with the ideals of the Shinobi and Naruto can respect that. Naruto's time is drawing near and he leaves Robin with scrolls on how to continue his training and scrolls that possess very powerful assets should he need them in the future(I won't say what they are. Only to the individual who accepts this challenge). Once Naruto finally passes(You can decide what happens to Kurama). Robin takes all his knowledge and heads towards Jump City.
Takes place during the first episode of Teen Titans, where Robin meets his future team in Jump City.
Abilities: Rasengan(Eventually, whenever you decide he should learn it). Kage Bunshin(He can only produce two clones since he doesn't have massive Chakra reserves yet). Any other Jutsu you feel like he should learn, give it to him. Sage Mode(If you want, just make sure he signs the toad summoning contract).
In this story Robin has to be stronger than he was in the original Teen Titans obviously. But make sure he isn't as serious as that Robin. The Robin from Young Justice wasn't as uptight and a little more carefree.
Pairings: Robin/Starfire or Robin/Raven.
Should any other Naruto characters make an appearance? Yes they can if you choose to write it that way. Good luck everyone!
MasterOfTheUnknown.