Zetsu is a member of Akatuski who's been shown to be a subordinate to - Nagato, Obito, Madara and finally Princess Kaguya. Divided into two, the black half is known as Black Zetsu, while the white half was known as White Zetsu. White Zetsu, along with his many clone siblings, was believed to be created by Madara Uchiha using a living clone of Hashirama Senju and the Demonic Statue of the Outer Path. However in the recent chapters, it was shown that White Zetsus were actually cultivated from the bodies trapped by the holy tree. According to the earlier chapters, it was shown that when Madara was on the verge of death, he infused a part of his will into White Zetsu, which created the second personality, Black Zetsu. But recently it was revealed that Black Zetsu was actually created by Princess Kaguya and that his purpose was to bring her back to power.
The two Zetsus were most of the time seen together, fighting as one body, but having different personalities even when merged. When they were together, they were easily distinguished by the two venus flytrap-like extensions that emerged from the sides, enveloping their head and upper body as a shell, which they were able to open and close. Beneath these extensions, Zetsu had short green hair and yellow eyes which helped him camouflage among the plants to an extent.
Splitting: Initially, they always appear as one entity, one body. But, they do have the ability to split, which divides them into two independent personalities, forming each a fully functional ninja. That is, the Black and White Zetsu. This helps not only to overcome the opponent in numbers, but brings more versatility to the fight, as they can now act independently. They split from the centre, and each of them, have two legs, but only one arm and half upper body. White Zetsu takes the left side, while the Black Zetsu takes right. In later chapters, Black Zetsu was shown to have a full body with the ability to transform his body to various shapes, more like water.
Communication: It is also shown that when apart, they can communicate with each other or his clones. This feature can better be utilized in the ninja world, to relay information to different places. Now how exactly did they do it? While separated, the two halves could extend roots underground to communicate with each other over long distances. He was able to create and remotely communicate with near-identical clones of himself.
Mayfly: Zetsu's signature technique was Mayfly , which allowed him to merge with the ground and organic vegetal life and move within it at great speeds through the
networks of roots and water veins virtually undetected so as to travel to a new location. Basically, when he merges, he does it with the same speed as when you're using HLAM. But travelling underground, he is second only to space time techniques. This technique was ideal for Zetsu's function as a spy, as it erased his presence as well, and was an ability that both halves as well as other artificial humans could perform. Although it was noted that Byakugan users can still spot the user. If an underground technique of higher rank is used, its possible to stop the user or force him to surface.
Basic Necessity: Being an artificial human, Zetsu is able to survive without food or water and did not need to carry out normal human bodily functions. Actions like breathing in water, is also not a necessity, as shown with his fight against Killer Bee.
Spore technique: One of the main abilities of Zetsu is the spore ability. Zetsu is able
to create spores of himself who can lay dormant, leeched onto a ninja. These can be used to leech chakra from the ninja and create Zetsu clones who can be used to attack but also to give said chakra to the user/allies. He can also leech chakra with direct contact with the opponent. How exactly the spores are planted on the opponent is not known.
"You can plan them without the person noticing it. Its unknown how this happens, but we assume its some sort of miniscule, unnoticeable particle spread on the air which he can then activate at will." -Scorps
As shown, White Zetsu was able to plant these clones on the bodies of others in the form of spores, which were undetectable even to sensor type, doujutsu users and Kage-level shinobi, etc. These spores are triggered upon the users will or after a set amount of time and grow into a white mass of a variable number of clones of White Zetsu, that engulf the target,
restricting their movement and absorbing their chakra as they grow. Through this technique, the user is able to create up to 4 clones. The clones can then be used for the clone body substitution technique or for simply combat.
Parasitic Cloning/Substitute technique: This ability goes hand in hand with the Spore ability. The cloning abilities allows Zetsu to, through his spore abilities or direct contact, copy the chakra of an enemy and create a virtually identical copy of them. Zetsu basically uses this technique to assume the form of any individual that he has touched, right down to their unique chakra. The clones can be produced from earth or organic vegetal matter as well as through Zetsu's spore technique. Only emotional sensing abilities can detect the difference. These clones will not be strong enough to fight an extended battle, so its primary purpose is for the function of a diversion. When the clone dies the appearance retains that of the person created until Zetsu releases it. These clones can use any technique the user knows up to A-Rank or, when they are used for the substitute technique, up to A-Rank of the basic 5 the copied ninja can use.
Sensing: As shown, Black Zetsu is a skilled chakra sensor. He can sense chakra over a wide distance and his sensing is of one of the highest levels.
Wood Release: Both the Zetsu halfs displayed the ability to use a rudimentary form of low rank Wood Release (up to A-Rank). In his case, this rudimentary form manifests itself through roots that he can create from the ground to attack his enemies. He lacks however, the ability to use normal wood techniques and can only use the root variation known to him.
Flytrap Absorption Technique: White Zetsu turns his body into a giant Venus Flytrap shape that wraps around the target, and then by opening his mouth he then begins the chakra absorption to drain the targets chakra.
White Zetsu Merging Technique: This technique allows several White Zetsus to
merge into a single large being with their venus flytrap-like middles opened up. The merged white zetsu have a resiliance to Naruto's Nine Tailed Chakra modes Yang chakra influence preventing them from becoming Trees.
Merging: Black Zetsu can merge with the opponent and take over his body as long as he is weak. He can make the opponent forcibly use the techniques to him advantage. This variation is still to be added into the RP.
White Zetsu on the other hand can merge with an ally, to provide him with an armour of sort. His body is very strong, and can even take on considerable damage, as shown when Tobi defended Kisame against Suigetsu's swing of sword. Again, this version is yet to be added into this RP.
Honestly, this is the max that I can get.