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The intellect devourer is a Tiny aberration, which would normally make it immune to the 1st level spell charm person, but when it successfully uses its Body Thief ability on a Medium humanoid:

The intellect devourer retains its Intelligence, Wisdom, and Charisma scores, as well as its understanding of Deep Speech, its telepathy, and its traits. It otherwise adopts the target's statistics.

Does adopting the target's statistics include the monster type changing from an aberration into a humanoid, which makes it vulnerable to charm person?

What happens when a charmed intellect devourer is Charisma (Persuasion) check'd into teleporting out of its host's skull and it becomes a Tiny aberration again? Is it still charmed?

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    \$\begingroup\$ Related: "What all is included in a creature's game statistics?" \$\endgroup\$ Commented Oct 27, 2019 at 0:45
  • \$\begingroup\$ The answer to the second question linked by @Medix2 reminds us that an intellect devourer inhabiting a humanoid can't be targeted by charm person in the first place. Does that mean this question deals with an impossible situation? \$\endgroup\$ Commented Oct 27, 2019 at 1:03

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Per this question, a creature's game statistics includes its type. One useful parallel is the the Druid's Wild Shape ability, which we have seen really does turn the Druid into a beast; for the same reasons, the intellect devourer that uses Body Thief really does turn into a humanoid.

It has also been established that, when something under the effect of a spell becomes an invalid target, the affected entity is no longer affected (unless/until it becomes a valid target again). So the intellect devourer would stop being charmed by charm person when it resumed its true form.

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