Pain and Konan once made a technique together called Divine Paper Mars. A Chibaku Tensei covered by the wings of God's angel, wings that exploded with enough force to shatter the planetoid.
This was called Divine Paper Mars. You embody this perfectly. When you are using your Rinnegan, you gain a secondary partner befitting of an angel who follows your actions in synchrony, maximizing everything to make sure you land your attacks or keeping your attacks at maximum power.
This angel will be a master at the Dance of the Shikigami, either your equal or your better in it, and will only be slightly weaker than you in general.
This secondary partner will not falter and will combine well with any moves you do, no matter what.
They are your angel.