One Piece Chapter 511

[Splash!]

And if the rule is to convert himself and his surroundings into what he has, then how do you explain Kizaru? Just making everything shiny and bright? Or what about Blackbeards. Would he just put darkness on stuff? Come on now. I'll give you Aces burning everything and Aokiji freezing things, but some of them are just a stretch. I think the true definition of someone being a logia is not being to die by conventional means. Letting objects pass through them and having the ability to exert put out a certain element of some kind from their body.

I never said that converting their surroundings to their element is how a logia user is defined. I was pointing out that any solid based logia element like wood, metal or diamond would have to be very similar to Aokiji's ability (the only solid based logia user we know of).

Also, I am hesitant on using your definition of a logia because Aokiji doesnt technically let objects pass 'through' him because his element is solid. Yes, as ice, he can be shattered and can reform himself but thats not the same.

I would define a logia ability based on these 3 points:
1. Immunity to damage from physical attacks.
2. Ability to convert their body into an element.
3. Ability to both emit and manipulate their element in their surrounding environment.

Blackbeard is very unique however, and doesnt fall under points 1 and 2. In fact, I would say that Blackbeard is not immune from physical attacks BECAUSE he cannot convert his own body into his element. So really, the only condition that encompasses ALL of the logia users we have seen so far is the 3rd one.