Figure I'd start a thread on this since its probably going to be a huge debate soon. Anyway..... Gear 4th's forms and appearance directly coincide with their attributes it looks like. Its definitely been discussed before BUT I think Luffy will get another form. Why? To make things clearer, lets go over Boundman. While its not specifically obvious with this one, Boundman's haki technically covers Luffy's entire body, as seen by all 3 pictures. I now believe Boundman to be the all around G4 type, where Power=Defense=Speed. This form is entirely "Balanced", in which in all instances G4 has shown to be strong, fast and has high defensive capabilities (as shown by the pic above). It however, may not be the best at any of the 3. The rest I consider "Unbalanced" with some reasons given below. Tankman: Tankman seemingly focuses on staying stationary and utilizing muscle balloon in a way that turns major defense into an offense by counter attacking. The lack of haki in the legs leads me to believe that it is nothing special in the speed department. So something along the lines of Defense>Power=Speed or Defense>Power>Speed We also know that this isn't the true form of Tankman since Luffy calls out "full version" immediately after. I'm sure we'll see the regular version in another situation. Lastly (for now): As stated by Luffy in this very chapter, Speed seems to take priority here, but perhaps focusing a bit on power as well, while entirely lacking defense (no haki in the torso). It also seemingly adds Gear 2 properties to the attacks ("Jet Culverin", etc) on top of original moves ("Black Mamba" and "King Cobra") So possibly: Speed>Power>Defense or Speed>Power=Defense So getting to my point I think there may be a "Powerman" at some point in the future. A form that entirely sacrifices defenses and speed for raw power. Boundman may seem like it is the raw power form, but it does give power to speed and defense as well. Another particular note is that Boundman and Tankman, while huge like Gear 3, do not actually combine Muscle Balloon with Bone Balloon. Snakeman just added "Jet" and potentially "Hawk/Eagle" (we'll see how if he does use it in this form) to G4's arsenal, perhaps Gigant/Elphant/Grizzly attack names get added to a power form that utilize stronger versions of Kong Gun, etc.. Anyway, perhaps there are only 3 forms and I'm wrong or perhaps there are even more variations of the 3 attributes. We probably wouldn't find out this fight anyway. Just wanted to start the conversation.