Besides the ones on top I'd include these as well, mostly as secondary roles(some have been already mentioned):

Fodder Generator: Ninjas that can consistently spawn clones that soak up damage from the enemy team. Examples are Naruto, Sai, Kabuto, Wind Main etc

Utility ninjas: This is a very wide and ranged category including all those ninjas that provide something to your own team. It can be broken down to multiple sub-categories like "Shielders"(Gakido, Kurenai, Iruka etc), Chakra Manipulators that were mentioned above, Buffers(Guy, field effect ninjas, Iruka, all the Pains etc), Wind Main with her refresh mystery and all that shenanigans

C***blockers as I call them: ninja with interruption skills like Iruka, Anko, Shurado, Guy etc.

Status Machines: Ninjas who primarily exist to inflict something on their opponents. Two major subcategories here, DoT infliction(GNW kankuro, Jiraiya, Karin) and Control Infiction(Itachi, Ningendo, Tsunade)

And lastly the Everlasting: Reviving Ninjas, which right now only includes Orochimaru and Hidan.