Got a spare moment so I'm gonna bring up an article that's been bugging me. Long story short, it's a list of Avatar The Last Airbender characters that can/can't pass the Chunin Exams. The Crossover-versus concept is fun, but the author seems to have a strange understanding of the exams and characters involved. An aspect that's heavily ignored is the emphasis on teamwork in the initial part of the exams. I'm gonna go over the characters mentioned. Later I might go into other ATLA characters, not included here. As a preface I wanna say that going by original Chunin exam, almost no characters except the Avatar and the White Lotus members would normally be able to clear the Chunin exam as victors (though you don't have to win the Finals to pass. Gaara, Sasuke, Rock Lee and Neji would absolutely terminate most of the ATLA verse, but for the sake of the post I'm putting it aside.
https://archive.is/UWKe1 >Ty-LeeTy Lee would presumably be teamed up with Azula and Mai. Mai is close to the performance of Tenten (in terms of fighting style) and if Sakura could pull through the Forest of Death and fight bandits and fodder nin in Part 1, then Ty Lee and Mai could clear that. Their lack of bending is what would probably keep them from passing the Finals (or preliminaries). Ty-Lee's mental fortitude may be weaker than Mai and Azula's under pressure, but she also tends to follow Azula's lead, and if Azula could pass the Written Exam, then so would Ty-Lee.
>Bumi Little to say here, it's spot-on, team-work wouldn't even be a necessity for him. It just feels out of place to put him in an exam for low-tier characters, as his character is more equivalent to a Kage.
>SukiShe and her Kyoshi warriors would do okay with the written exam given how disciplined their martial studies are and possibly the Forest of Death due to teamwork and CQC, but they wouldn't make it through the Finals. Azula, Mai and Ty-Lee took them all out by themselves, Suki is the most skilled and she'd only pass the prelims if her opponent's weren't long-distance attackers like Temari.
>Zuko His fire-bending, even early on in ATLA is fairly powerful, but only late-series Zuko would make it through the exams considering heavy hitters of the Genin. Gaara's sand alone would be immune to his fire. As part of a team (say Aang and Katara or Toph and Katara or really any mix)
>KataraThis is a heavy disagree - Katara is kind-hearted but she's proven herself capable of taking action and pushing herself to the extreme if necessary. The moments of mercy she shows to Hama and Yon Rha were because she chose not to kill a defenseless opponent. Her use of ice and water blades is deadly and its the show's Rating that spared viewers the sight of dead Fire Nation troops. She doesn't need to use blood-bending (can't without a Full Moon anyway) but she can draw water out of plants, earth and sky and with enough can overwhelm large numbers of people. The Forest of Death has rivers and sources of water that would permit this. Further, she'd be on a team, ideally Toph, Aang and her or even Toph, Zuko and her; which would absolutely have her weakspots covered. The prelims/finals would be the main problem, especially as by that point opponents would avoid using water techniques against her, robbing her of a primary fighting mechanism, which is the real reason she'd likely lose the exams.
>Toph Tough Tomboy Toph would pass even as a blind girl, we see plenty of blind or eye-covered Genin, Chunin and Jonin so that's not a problem. Still her blindness and small size would cause opponents to under-estimate her. Her hearing and vibration sense means she could cheat the Written Exam easily (similar to Dosu) and sense the proctors. Considering previously mentioned team combos, Toph would absolutely dominate the Forest of Death, ironically her blindness would make visual genjutsu useless. Prelims/Finals would be mostly easy. Only the Sound Team would have a method of directly targeting her sensitive hearing (and even then it's not her kryptonite) and she's fast enough to defend against fast attacks. Rock Lee and Gaara would be those she wouldn't be able to beat, but most everyone else would be a cinch.
>Sokka Wouldn't pass but the part about him failing the exam would mostly apply to Early Sokka. Wan Shi Tong wasn't being manipulated and there isn't much you could do to manipulate a spirit as old, cynical and well-read as the Owl-Librarian.
>Azula Same as Zuko, except her flames are hotter and she's a more talented fighter. Would still run into the wall that Gaara, Neji and Rock Lee are, and Sasuke's Sharingan would mean he could beat her (the Chidori guarantees it). Naruto would probably beat Azula out of sheer tenacity and quick-wittedness, like most characters.
>Iroh Like Bumi, completely out of place here. Would definitely pass in terms of physical and mental capabilities, but it would be out of character.
>AangDefinitely could pass so long as he already knows at least Earth and Water as well as Air. Fire would be useful, but those would be key in him dismantling opponents like Gaara.