Virtues
Adaptable: ERROR does not have issues with change of plans. There are a number of instances in Aincrad where a player is forced to adapt to a situation, and ERROR is no stranger to them. Unlike most however, given their nature it is easier then it is for most for them to adapt to the change in circumstances.
Intricate: ERROR has layers, like an onion. Given how ERROR performs socially, its very hard to get a read on ERROR. This extends beyond just a conversation, ERROR is hard to track down and hard to locate. The only real way to find them, is if they find you.
Resolute: They do