The user can implant memories into the minds of others, which can either be the memories of others, or false memories manufactured by the user. They can completely re-write a person's memories to change their personalities, knowledge, self-identifications, etc.
Doraemon (Doraemon) using the Memory Disk to extract a memory of Suneo witnessing Nobita wetting his pants in public...
...and then create a false memory and implant that into Suneo...
...making Suneo inadvertently telling Shizuka that he wet his own pants when he got too excited...
...and since that memory came in place of the original so suddenly, he could not stop himself from saying it until it he realized too late he humiliated himself.
Blindspot (Marvel) is able to selectively absorb the memories of others, store them within her own mind, and transfer them to others, even if they do not belong to the person or people she is giving them to
Neuralyzer (MIB); before or after use, one can supplement new memories to those affected
Jack Force (Blue Bloods Series) was able to implant a memory of a past life of him and Allegra Van Alen on her daughter.
Kessler (Infamous) can implant his memories into the minds of others, though he is only shown doing this to his past self, Cole McGrath.
Charlotte Pudding (One Piece) ate the Memo Memo no Mi, giving her the power give someone fake memories.
Nea D.Campbell (D.Gray-man) was killed by the Earl and devoured him. After 20 years he was reincarnated within Allen Walker body and implanted all of his past life memories as a host in Allen's body when he was alive.