Orochimaru, one of the legendary sannin, is the most offensive out of the three. His kit is fairly unique and solid as every offensive jutsu he has inflicts poison, so let's go over his kit.
His ultimate, Multiple Striking Shadow Snake, makes Orochimaru strike multiple times in front of him, doing a lot of damage and inflicting a poison that last an extremely long time. This ultimate is best utilized if the enemies are lined up. On defense, even being tagged by the tip of the ultimate can mean death for you as the poison inflicted last for a very long duration.
His 4*, Striking Shadow Snake, sends out a snake in front of him, causing moderate damage but inflicting a long lasting poison. This generally has to be used up close melee range to be effective.
His fist 3*, Purple Tagged Kunai, sends out three poison-tagged kunai in a cone, doing more initial damage the more kunai you land. It also inflicts poison for a decent amount of time. His final 3*, Teleport jutsu, works very similarly to Itachi V1. Orochimaru blinks forward a fixed distance and it has a one second cooldown.