Fish-Man Karate and Fish-Man Jujutsu, two of the strongest styles of Fighting in One Piece.
Using the natural "Super Human" strength of the Fish-Man, and utilizing (At times) Massive amounts of Water, even from the very Ocean itself.
Combining that with "Swordplay" could result in some of the most powerful and deadly attacks in One Piece.
Kawamatsu already has a style unique to him called Kappa-ryu, and has used an attack Called Amano-gawa.
Now this attack seems to only be using "Ryuo" and his strength and not any Fish-man Jujutsu. If He was near enough to Water and could infuse his Kappa-ryu style with Fish-Man Jujutsu. he could do some of the strongest attacks in One Piece.
Using the natural "Super Human" strength of the Fish-Man, and utilizing (At times) Massive amounts of Water, even from the very Ocean itself.
Combining that with "Swordplay" could result in some of the most powerful and deadly attacks in One Piece.
Kawamatsu already has a style unique to him called Kappa-ryu, and has used an attack Called Amano-gawa.
Now this attack seems to only be using "Ryuo" and his strength and not any Fish-man Jujutsu. If He was near enough to Water and could infuse his Kappa-ryu style with Fish-Man Jujutsu. he could do some of the strongest attacks in One Piece.
