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Description
Little sketch of Mind Flayer.
More information about this monster from Forgotten Realms Wikia:
The mind flayer, also called the illithid, is an evil and sadistic being, humanoid in appearance, but with a four-tentacled octopus-like head. These beings are feared throughout the Underdark for their telepathic abilities and usually are not without two or more slaves, mentally bound, to each individual mind flayer. Although they cooperate to achieve a goal, they will back away at the first sign that it is not something that will be self-profitable. They are capable of speaking Undercommon, but prefer telepathic communication and will attempt to mentally dominate any non-slave, non-illithid they meet. Some theorized mind flayers to be aliens from the future (as stated in The Sargmne Prophecies), who had come back in time to save their species from extinction. Another tale is that they are cursed inbred mutant offspring of humans from a distant world. However, more convincing evidence points to a more sinister origin in the Far Realm. They feed on the brains of sentient creatures and are thus feared. Their natural psionic abilities also make them respected in the eyes of the drow, beholders, duergar, and the other dominant races of the Underdark.
The mind flayers are feared by all beings in the Underdark because of their great mental prowess. Every illithid has a small array of mind-affecting spells to take control of their prey as well as a powerful mind blast to affect a multitude of foes. The mind flayer's mind blast is a 60-foot (20m) cone that stuns anyone caught within it. The mind flayer can also innately cast three mind-affecting spells: charm monster, detect thoughts, and suggestion. Mind flayers are also capable of casting levitate and plane shift.

Normally, a mind flayer will use its mind blast ability to stun a few foes and then drag them away to feed. Once it has its victims, it will attach all of its tentacles to the head of its victim. Then, the mind flayer uses its extract ability to suck out the brains of its victims, instantly killing the victim, as long as it only has one head. The mind flayer uses its other spells mainly to enslave its minions and keep them under total control, as well as on the battlefield....

More about this monster read here [link]

I don't know but I like more the chibi form.

Description
Little sketch of Mind Flayer.
More information about this monster from Forgotten Realms Wikia:
The mind flayer, also called the illithid, is an evil and sadistic being, humanoid in appearance, but with a four-tentacled octopus-like head. These beings are feared throughout the Underdark for their telepathic abilities and usually are not without two or more slaves, mentally bound, to each individual mind flayer. Although they cooperate to achieve a goal, they will back away at the first sign that it is not something that will be self-profitable. They are capable of speaking Undercommon, but prefer telepathic communication and will attempt to mentally dominate any non-slave, non-illithid they meet. Some theorized mind flayers to be aliens from the future (as stated in The Sargmne Prophecies), who had come back in time to save their species from extinction. Another tale is that they are cursed inbred mutant offspring of humans from a distant world. However, more convincing evidence points to a more sinister origin in the Far Realm. They feed on the brains of sentient creatures and are thus feared. Their natural psionic abilities also make them respected in the eyes of the drow, beholders, duergar, and the other dominant races of the Underdark.
The mind flayers are feared by all beings in the Underdark because of their great mental prowess. Every illithid has a small array of mind-affecting spells to take control of their prey as well as a powerful mind blast to affect a multitude of foes. The mind flayer's mind blast is a 60-foot (20m) cone that stuns anyone caught within it. The mind flayer can also innately cast three mind-affecting spells: charm monster, detect thoughts, and suggestion. Mind flayers are also capable of casting levitate and plane shift.

Normally, a mind flayer will use its mind blast ability to stun a few foes and then drag them away to feed. Once it has its victims, it will attach all of its tentacles to the head of its victim. Then, the mind flayer uses its extract ability to suck out the brains of its victims, instantly killing the victim, as long as it only has one head. The mind flayer uses its other spells mainly to enslave its minions and keep them under total control, as well as on the battlefield....

More about this monster read here [link]

I don't know but I like more the chibi form.