Obviously Naruto himself is a must - he's the main character. Sasuke could also be included as he often has his own journey parallel to Naruto's. And of course, the F Dragon. Another great character could be Kakashi. His wisdom and experience would be useful in a story involving a mysterious dragon. He could help Naruto understand the nature of the F Dragon.
In addition to Naruto, Sakura would be a good addition. She has grown to be a strong kunoichi. Her medical skills might come in handy if the F Dragon or Naruto gets injured. Shikamaru is also a great choice. His intelligence could be used to strategize against any threats that come with the presence of the F Dragon. And the F Dragon, being the unique element, would bring a whole new dynamic to the interactions between these characters.
Definitely Naruto himself, since it's a drunk Naruto fanfiction. His friends like Sasuke and Sakura should be included too. Sasuke could react in his typical stoic but secretly concerned way when Naruto is drunk. Sakura could be the one trying to get Naruto to sober up or at least stop making a fool of himself. Kakashi would also be great, as he could have some humorous reactions to Naruto's drunken antics.
Sly Cooper would be a great addition. Sly's sneaky, thieving skills could add an element of stealth to a Spyro crossover. He could help Spyro steal back a precious artifact that has been stolen by their common enemy, using his lock - picking and acrobatic skills.
Obviously Naruto himself. He is the main character and his connection to the One Tail is the core of the story. Kakashi would also be a great addition. His wisdom and experience can help Naruto deal with the challenges related to the One Tail, like teaching him new ways to control it.
Shikamaru is a smart choice. His intelligence can be used to solve problems that Kakashi, Naruto and the others face. And his lazy - but - actually - really - smart attitude can provide some comic relief. Also, including the Third Hokage can give the story more depth, as he is the leader of the village and has a lot of knowledge and influence over the kids' lives.
Definitely Sasuke. His complex relationship with Naruto provides a lot of material for fanfiction. You can explore their friendship, rivalry, and how they grow together. Kakashi is also a great character to include. His wisdom and unique jutsu can add depth to the story. And of course, Sakura. Her growth as a kunoichi and her relationships with Naruto and Sasuke can be interesting to write about.
Naruto himself is a must - he's the main character after all. Sasuke could also be great as his rival. Their interactions around the kit would be interesting, like if they both wanted it for different reasons. Sakura could be included too, maybe she helps Naruto figure out how to use the kit.
Well, in addition to Naruto and Urahara, Ichigo from Bleach could be a great addition. Since Urahara has a connection with Ichigo, and Naruto's energetic and positive nature could create an interesting dynamic with Ichigo's more brooding personality.
Definitely Naruto himself. His determination and positive attitude can bring a lot to the story. Lala too, of course, with her fun - loving and inventive nature. Sakura could also be a great addition. She could interact with Lala in interesting ways, perhaps learning about Lala's technology and applying some of her medical skills to help Lala if she gets injured.
Definitely Kakashi. Since he has a connection to both Naruto and Tobi (Obito), his presence can add a lot of depth. He can be the one who tries to bridge the gap between Naruto and Tobi, or he could be a source of conflict as he has his own history with Tobi.
Definitely Naruto himself. His unique abilities and his never - give - up attitude would add a lot to the story. For Salem's side, Salem herself is a must - include as she is the central figure in her world. Also, characters like Sasuke from Naruto could be interesting as his complex personality and powerful skills would create interesting dynamics. And maybe some of Salem's loyal followers like Cinder could also be included to add more conflict.