Mr Clever

"Mr. Clever" was the self-proclaimed moniker of a Cyber-Planner that tried to overtake the Eleventh Doctor's mind in an attempt to resurrect the Cybermen.

Creation
Mr. Clever was created when the Eleventh Doctor was infected by Webley. Although it was able to take over nearly half of the Doctor's mind, the Doctor retained the other half of it; with a small percentage of his mind unclaimed by either. The Doctor threatened to regenerate, stalling Mr. Clever. The two then decided to play a game of chess, while also attempting to lead their respective allies to victory in the physical world.

Mr Clever was eventually defeated when the Doctor distracted it by claiming to have a way to avoid defeat in chess, tricking it into deactivating all other Cybermen in order to divert the necessary processing power to himself to calculate the Doctor's next move. With the processing power of all Cybermen temporarily in the Doctor's mind, the Doctor removed it from his brain with a modified hand pulse. Mr Clever was then redistributed within the Cyberiad and was thought to be destroyed when Hedgewick's World was imploded by command of Emperor Ludens Nimrod Kendrick Cord Longstaff XLI. (TV: Nightmare in Silver)

Resurgence
Its consciousness was in fact preserved by the Cyberiad, which constructed a new cybernetic body in the image of the partially cyber-converted Doctor. Mr Clever used the knowledge retained from the Doctor's mind to plant Cyber-conversion units at various Waypoints across space and time, wanting to use a Time Drill to drill a hole in the universe. (GAME: Lost in Time)

Psychological profile
Mr Clever was quite arrogant, not even considering the potential of losing, absolutely resolute that there was no way he could lose. He was ruthless and lacked any sense of honour, intending to go back on his agreement with the Doctor and kill everyone anyway.

Unlike most Cybermen, it displayed a distinct personality and emotional responses, likely due to being influenced by the Doctor's formidable persona. His personality manifested in the occasional use of such phrases as "Allons-y" or "Fantastic!", often used by the Doctor's previous regenerations, as well as its decision to name itself and the choice of name. Mr Clever also shared the slightly manic attitude of the Doctor; leaping on tables and twirling on the spot when excited. (TV: Nightmare in Silver)