Maruboshi Renji/Abilities

Physical Strength
Pphysically, Renji is very powerfull, capable of easily of superhuman feats such as throwing giant boulders and cutting steel using a normal sword.

Speed and Reflexes
Renji is exetremly fast and agile, he also has incredible reflexes that contribute to him being one of the strongest swordmen in the world.

Swordmanship
Renji is an extrremly powerful swordman, proved by the fact that he can hold his own against the world's greateset swordman in their many battles, he can use flying slash attacks and can easily cut through pacifista who are supposed to be harder then steel, he also channels busoshoku haki through his to make his attacks much more powerful.

Devil Fruit
Renji ate a powerul Devil Fruit called Jikan Jikan no Mi, Model:Chronoception that allows him to control other's Time perception sense, capable of giving them temporal illusions such as time slowing down, stopping, speeding up, or running backwards.

Haki
Kenbunshoku Haki: Color of Observation

Busōshoku Haki: Color of Armaments

Haoshoku Haki: Color of the Conquering King