Gildarts could be a dark horse. His magic is extremely powerful and his experience in the magical world is second to none. Although he might seem laid - back, when it comes to a competition like the Triwizard Tournament, he could pull out all the stops and surprise everyone with his skills and strategic use of magic.
Erza would also be a strong contender. With her vast array of armors and combat skills, she can adapt to different situations easily. Whether it's a task that requires brute force or some strategic thinking, Erza can handle it. She has the discipline and experience to outperform many opponents.
Natsu. He's got incredible power and determination. His ability to eat fire and use dragon - slayer magic gives him an edge. He's not afraid to take risks and he's always ready for a fight, which would be very useful in the various tasks of the tournament.
Natsu would be a strong contender. His dragon slayer magic gives him great strength and endurance, and his determination to win would be unwavering.
Laxus might also be a likely champion. He has lightning - fast reflexes which are crucial in boxing. His confidence and powerful attacks could easily intimidate his opponents. He would be able to deliver strong punches with the added advantage of his lightning - based powers, even if it's a boxing - only tournament, his natural physical abilities would still shine through.
Ruby is a likely winner. She has her powerful scythe, great speed, and strong leadership skills. Her ability to quickly analyze a situation in battle gives her an edge. Weiss also has a good chance. With her Glyphs and powerful summoning abilities, she can control the battlefield. Blake is another one. Her speed and shadow - cloning ability make her a tough opponent. And Yang with her super strength and ability to take a hit and then counterattack fiercely could also be a top contender.
Harry and Ron would be her most likely allies. They are her best friends, and even if they might be initially shocked or jealous of her being in the tournament, they would surely come around to support her. Another likely ally could be Cedric Diggory. He's a fair - minded and kind wizard, and he might see Hermione's intelligence and skills as an asset and offer to help or at least be friendly towards her.
One idea could be that Natsu enters the Triwizard Tournament and has to face off against some really tough opponents from different magical guilds. His dragon - slayer magic causes all kinds of chaos during the tasks.
Gray is another candidate. Gray's cool and collected demeanor could contrast with Tobi's more mysterious nature. They could get into arguments about the best way to handle a situation, like when facing a powerful enemy. Or, they could find common ground in their skills and work together to protect Fairy Tail from danger.
Makarov could be a great teacher. He has a wealth of knowledge and experience in magic. He could teach advanced magic techniques and also lessons about leadership and guild values. He would be strict but also very understanding and always ready to give good advice to the students.
Hermione Granger is often a popular character. Her intelligence and love for learning make her a natural fit for the academic aspect of the Triwizard Tournament. She can be portrayed as using her vast knowledge of magic to outwit her opponents in the various tasks.
Another character who could run a burger joint is Macao. He seems like the type who would enjoy the hustle and bustle of running a business. He has a lot of experience in the guild and is good at dealing with people. He could use his fire magic to cook the burgers in a unique and fast way, adding a special touch to the food at his burger joint.
Natsu from Fairy Tail and Maka from Soul Eater. Natsu is a hot - headed and powerful mage, always eager for a fight. Maka, on the other hand, is a determined Meister with a strong sense of justice. Their common goal of defeating powerful enemies would likely bring them together. Natsu's brute strength and Maka's strategic thinking could make for a great combination in battles.