Acqua of the Back (A Certain Magical Index) possesses Divine Mother's Mercy as such he is a completely sinless human and is immune to all forms of sin, including the sin of murder and even divine punishment
Ye Sheng (The X-Dormitory), being the Embodiment of Goodness, is immune to the wish-granting bowl's compulsion that heightens others' greed…
… and destroy it.
Ogudomon (Digimon) is the embidoment of all sin, and therefore has the power to atone for any sin, no matter what. This makes Ogudomon undefeatable by any being with sins in them.