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FATE/GRAND ORDER JP SPOILERS AHEAD!
Thanks (or no thanks!) to Baal and Archer of Shinjuku's meddling, the Doppelganger was grafted into the Assassin of Shinjuku's Saint Graph. The Doppelganger is a Phantom, an urban legend — in other words, an entity unable to become a Heroic Spirit. However, fusing a Heroic Spirit with a Phantom bestows them with the Phantom's powers. In Assassin's case, the Doppelganger allows him to do the following:

The ability to change his appearance at will.
He can only transform into other sentient beings with identities. (i.e. a statue - no; your mom - yes; your favorite anime character - yes; your dog - that's cursed) His disguise is indistinguishable from the original and can't be detected via magical means. He is capable of copying a Servant's skills and Noble Phantasms, but for personal reasons he doesn't copy the latter.

The ability to assimilate his chosen identity's feelings and memories upon transformation.
This lets him perfectly copy his chosen identity's behavior and mannerisms. Memory probing is possible and inevitable.

<b>May the Assassin of Shinjuku transform into your character and therefore assimilate your character's memories?</b> Yes or no. If yes, feel free to discuss what he might be able to glean from your character's memories. No need to go in depth; we can always go into detail in the event he does transform.
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