Who Would Win?

Leonardo

Ninja

Ninjutsu Mastery, Twin Katana Swordsmanship, Leadership, Tactical Strategy, Stealth, Enhanced Agility

Twin Katanas, Shuriken

Teenage Mutant Ninja Turtles

Aztar

Spirit of Vengeance / Cosmic Agent

Flight, Super Strength, Super Speed, Agility, Invulnerability, Telepathy, Telekinesis, Intellect, Teleport, Psychic, Force Field, Blast Power, Healing, Magic, Invisibility, Phasing / Ghost, Shape Shifter, Fire Control, Psionic, Insanely Rich, Elasticity, Weather Control, Divine Powers, Siphon Abilities, Size Manipulation, Immortal, Necromancy, Electricity Control, Sub-Mariner, Mesmerize, Penance Stare, Escape Artist, Tracking, Astral Projection, Danger Sense, Possession, Sand manipulation, Adaptive, Electronic interaction, Animation, Super Eating, Precognition, Energy-Enhanced Strike, Light Projection, Reality Manpulation, Levitation, Duplication, Emotion Control, Dimensional Manipulation, Animal Control, Omni-lingual, Energy Shield, Time Travel, Siphon Lifeforce, Sense Death, Darkforce Manipulation, Power Mimicry, Gravity control, Darkness Manipulation, Illusion Casting, Heat Vision, Wind Bursts, Density Control, Genetic Manipulation, Time Manipulation, Death Touch, Hypnosis, Water Control, Energy Absorption, Cosmic Awareness, Willpower-Based Constructs, Heat Generation, Energy Based Constructs, Stealth, Berserker Strength, Longevity, Flame Breath, Hellfire Control

None (cosmic power)

All-Star Squadron, Angels, Black Lantern Corps, Dark Army, Justice League Dark, Justice League of America, Justice Society of America, New York Police Department, Red Lantern Corps, The Quintessence