The user can steal/absorb selectively knowledge from others or objects such as books or computers, and store the taken knowledge within their own minds. By stealing the knowledge from the minds of others, they can leave their victims in a state of permanent dementia, or simply bestow a temporary lapse in memory.
A Seeker (Charmed) absorbs knowledge from a victim.
Brainiac (DC Comics)
Abzorbaloff (Doctor Who)
Nail (Dragon Ball Z) uses an ancient Namekian technique to merge with Piccolo, gaining access to the latter's knowledge and memories.
Alucard (Hellsing) is able to gain access to the knowledge and memories of others by drinking their blood.
Freddy Krueger (A Nightmare on Elm Street) has acquired the knowledge and skills of his victims, such as martial arts talent, by absorbing their souls.
Ann Marie LeBeau/Rogue (Marvel Comics)
Using the Cranial Disruption, Death's Head (Marvel Comics) can download an opponent's mind into himself, absorbing their knowledge, experience, tactics, and combat skills.
As an Osmosian, Kevin Levin (Ben 10 series) can absorb knowledge and memories through physical contact.
Alex Mercer (Prototype) can gain the knowledge, skills, and memories of others by consuming them.
Legendary Knowledge Magisword (Mighty Magiswords) can be used to steal it's target's knowledge.
Brainiac (Smallville) in the process of absorbing information from the mind of his creator Dax-Ur.
During assimilation/replication processes, The Thing (John Carpenter's The Thing) gains the knowledge of its victims, making it become more intelligent.
After a shard of the AllSpark fell out of a sweater it imprinted a large collection of ancient transformed Cybertronian knowledge onto Sam Witwicky (Transformers) brain which shortly thereafter began to see strange symbols right in the middle of his position.
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