The clue is in his name. Seraph (or seraphim) are part of the order of angels in many religions. He also tells us:

“I protect that which matters most.”

 

Seraph – The Matrix Reloaded

Now, although the Oracle is not necessarily representative of the Judaic or Christian God, she is representative of religion. As such, Seraph is the protector of religion. He is powerful, but prefers peace, only using violence when necessary.

The Vatican has its own small army, Shaolin monks have Kung Fu. This is what Seraph symbolises.