Great Work on the Tier List, just some things don[t make sense to me; This list is based on 'what they bring towards their team, especially optimal ones'. Now, while i don't argue that Itachi and Minato are two ninjas that are used very often, I've almost never seen Onoki used with them. Sure, his passives would be great with them, but Onoki himself is not used that often apart from a few specialized teams. Barrier breakers like Roshi or Hashirama also negate Onoki's advantages. Compared to that, Mifune being ranked LOWER doesn't make much sense, since Mifune not only gives good buffs, they can't be negated except by Han, and Mifune is used quite frequently. In terms of 'what they bring towards their team' AND 'global usefulness', Mifune is superior to Onoki. I think with Onoki you may have stepped too far into the theoretical; sure, he's theoretically good for commonly used ninjas like Itachi and Minato, but if nobody really uses Onoki with them then that's not a good reason to place Onoki that high. Moreover, on almost any other lineups that Onoki could benefit, people simply use other ninjas - Gaara for Wind, Mei/Danzo for Fire. Earth is really the one place i see Onoki (especially Lee blitz teams). If your main basis for placing ninjas is if they're useful to hypothetical teams that aren't really used, then that makes me question if your Tier list is actually useful.