I am surprised that no one here has mentioned that SAO is chock full of RO References.
For instance, the ''first armor'' that everybody wears in the first episode shares a deep resemblance with the Novice outfit.
And that Silica tamed Pina by giving it is favorite food, just like a tame item. Not to mention that Pina had a low-power healing skill which aided her (sorta reminds me of Sohee's skill).
