Monkey D. Luffy (Gear 4th), Battle Wikia

Gear 4th (or Gear Fourth) is a technique used by Monkey D. Luffy in order to inflate his muscular structure into warped proportions.

Luffy's Base vs Gear 4th Comparison.

Monkey D. Luffy (Post-Timeskip), VS Battles Wiki

The Life Of Monkey D. Luffy: Part 4 (One Piece)

Pre-awakened Luffy vs Admiral Fujitora - Battles - Comic Vine

Monkey D. Luffy (Post-Timeskip), VS Battles Wiki

Who's stronger, Gear 4 Bounce Man or Snake Man? - Quora

Monkey D. Luffy (Post-Timeskip), VS Battles Wiki

One Piece: 4 characters that can take on Luffy's Gear Fifth (and 4 that cannot)

User blog:MonkeyOfLife/MonkeyOfLife's Monkey D. Luffy, VS Battles Wiki

Character Profile - Monkey D. Luffy

Patrick Redfield, VS Battles Wiki

User blog:MonkeyOfLife/MonkeyOfLife's Monkey D. Luffy, VS Battles Wiki

Monkey D. Luffy (Post-Timeskip), VS Battles Wiki

One Piece (season 13) - Wikipedia