I suppose I can TRY for Fire Emblem Tier 7.
Goalie:
Anankos: He's a big boi. Will be hard to goal against someone of his size.
Defenders:
The Black Knight: Can teleport around to try and stop the ball.
Byleth: Has divine pulse, so they can turn back time if the enemy ever scores.
Azura: Can help amp her team and increase their morale, while at the same time reducing the enemy team's will to fight.
Mid-Fielders:
Alm: Has precog, and can turn back time if he ever fails at stealing a ball/passing it to a teammate.
Lysithea: Can warp the ball/other teammates.
Grima: Can summon an army of risen to try and steal the ball/defend.
Ike: Has Nihil, which will passively nullify any passives the opponents might have.
Forwards:
Marth: Has passive mindhax, so anyone that tries to take the ball away from him will fail without resistance to it.
Lucina: Has Hawkeye, which ensures that should she try to goal, it won't miss. Will also always strike first no matter what.
Dimitri: Has immense strength compared to the rest of the team. (with the exception of Byleth)