Emperor (Warhammer 40,000)
The Emperor of Mankind is the the immortal founder of the Imperium of Man and the most powerful Human psionic known to exist. He is worshipped as a god on all Imperial worlds.
Current Condition
Following the rebellion of Primarch Horus, the Emperor was forced to enter the Golden Throne, a special life-support system of his own design. His condition continues to deteriorate, however, and while still able to use his psionic powers to maintain the Astronomicon and enhance ordinary human psykers to be capable of astro-telepathy (telepathy over interstellar distances), he is only marginally conscious, at best, and the High Lords of Terra do all decision-making for the Imperium.
There are rumors that this life-support machine is also his bodyguard, and that it can transform into something with 10 times the power of one of the mighty Imperator Titans.