Honestly I am going to say it Luffy the weakest out the big three (I watched all the big three animes btw)

Here 5 reasons he the weakest of out of the big three MCS

1. No Hax or Spiritual Abilities
Luffy relies on physical strength and Haki. Naruto and Ichigo have reality-warping, soul-based, or spiritual powers Luffy can’t counter.

2. Can’t Hit or Defend Against Intangibles
Luffy has no way to interact with spiritual beings or chakra-based hacks like Genjutsu. He can’t touch Ichigo or resist Naruto’s abilities.

3. Lower Power Scaling
Naruto and Ichigo scale to planetary or higher. Luffy is at best continental. One Piece just isn’t on the same destructive tier.

4. No Regeneration
Naruto and Ichigo can heal or regenerate mid-fight. Once Luffy’s worn down, it’s game over—no regen, no second wind.

5. Less Speed and Versatility
Naruto and Ichigo have FTL combat feats, ranged attacks, and multiple forms. Luffy’s Gear 5 is flashy but limited in scope and reach.