Barbara: Her bedroom from the apartment she shared with Frankie for the good and for the bad the love letters that her brother received while in prison as a reminder of where she is still needed and what he's still capable of.
Nebula: The folded football she and Tony used in their first game for the good, and the stasis tech used by Thanos when torturing her for the bad.
Kitty: One of the lab/medical spaces from the Mansion for the good. And for the bad one of her wedding invitations to Piotr sent to everyone in town. Talk about embarrassing.