As Rogue is absorbing the total psyche of a person, there is a risk of a personality overwhelming her and taking control of her body. It has also been shown that even though the memories she has absorbed eventually fade when a psyche returns to its body, remnants, or "echoes", of the personalities of victims whose memories she has absorbed remain buried in her subconscious indefinitely, and while there is little to no risk of those personalities overwhelming her like the Ms. Marvel personality could, they can occasionally make their presences known.