Now he is Error sans Formerly known as Geno. His mind reset and never remembered a thing.

Are Geno and error the same person?

Error, Fresh, and Geno are not actually brothers. This joke was coined from the fact that CQ made all three sanses, there's even a comic series based around this premise. But it never will actually be canon.

Is error sans straight?

Though they have no canon relationship, he's often been depicted with the self-proclaim Protector of the Multiverse.