Megacephaloid Physiology

The ability to have the body of megacephaloid, a being whose brain is greater than some or all of its body parts.

Capabilities
Users with this ability have an oversized encephalic mass that is disproportional to its body mass, and aside from having the disadvantages of such a condition, they may possess most if not all mind based suerpowers:

Association

 * Mind Control
 * Telepathy
 * Hive Mind
 * Illusion Manipulation
 * Memory Absorption
 * Memory Manipulation
 * Telepathy
 * Telekinesis
 * Telepathic Communication
 * Telepathic Perception
 * Telepathic Reception
 * Mind Exchange
 * Psychic Shadow
 * Neurocognitive Deficit
 * Psionic Shield
 * Psionic Inundation
 * Psionic Equilibrium Distortion
 * Psychic Constructs
 * Psychic Navigation
 * Psychometry
 * Pushing
 * Enhanced Intelligence

Weakness

 * limited locomotion (unless one have telekinesis)
 * Atrofiated limbs
 * Boredom (due to quickly deducing what others will say and do, as well as what will happen)
 * Believing oneself to be invincible and\or superior to others (megalomania)
 * May need asistance to due to poor health

Limitations
People with high IQ tend to suffer from certain unexpected effects on ones personality, for example: Due to great cerebral activity, a user may spend many nights in awake and eventually become emotionally unstable and suffer from depression. Megalomania is another great danger, because when a person contiuously believes he or she is superior in anyway to others, he or she may be prone to manipulate others and even belive himself invincible due to the pride that this power inspires. This also explains why so many highly intelligent characters are commonly seen as villainous, since it is needed great humblety to manage this ability.