If you want Batman go Avenger Paladin and get Tavern Brawler and pump dex and strength.
They even call the subclass the Dark Knight. And with find Steed you can summon a Giant Bat.
Hunter's Mark Spell allows you to deal more damage and track the spells target, Oath of Enimity channel divinity power gives you advantage agianst the target. He can cast haste on himself and it will work on his giant bat mount.
Soul of Vengence allows you to wack the target of your oath of enimity if they attack anyone else, Relentless Avenger allows you to move half your speed when you hit someone with an attack of opportunity, and Avenging Angel allows you to grow wings (bat cloak) and fly while projecting an aura of menance (causing fear) against any enemies that come near you. I could continue.
Tavern Brawler boost strength, gives him unarmed fighting and improvised weapon fighting, with grappling as a bonus action.
I'd say the Ninja Monk is more Nightcrawler, stealthy, bamphing ability, good unarmed attacks and wasn't Nightcrawler a monk or something at one time.
Fighter Battlemaster or Champion with Shield Master and Tavern Brawler is Captain America.
Monk of the 4 Elements or Barbarian Totem Warrior is Superman.
Dr. Strange is a Warlock.
She-ra Fey Bladelock maybe. Or Fey Knight.
Wolverine Champion Fighter.
Storm Tempest Domain Cleric. Use Magic Iniate feat to get shock grasp.
Godzilla, Dragonborn with an enlargement spell.
Lady Death, Eldrich Knight.
Purgatory Tiefling Dragon Sorceror.
Blink Tiefling (without horns) Fey Bladelock
Wonder Woman, Monk of the Way of the Open Hand.
Collosus Druid of the Circle of the Moon, becoming a Earth(metal) Elemental.