The first ninja that comes to mind is Hiashi who increases the evasion rate by 20% on Hyuga units who can evade by themselves (like on Neji, GNW Neji, Hinata and GNW Hinata). Then there are ninjas like Suigetsu Taka that give a flat 30% evasion to all HIdden Mist units. None of them stack however.

Yeah that is true but Mangetsu works more like a buff and the evasion is always 100% guranteed and only triggers once per round. I was under the assumption you wanted to know about ninjas that can increase the overall evasion rate of units as an unremovable passive and not the ninjas that gives a buff that lets them dodge once per battle. But technically yeah Mangetsu falls into the whole giving evasion category but it's a removable buff and not a passive.