Mr Phobos

Mr Phobos was the most successful Metahuman Abomination ever created by a non-Governmental entity.

Physiology
Mr Phobos was a being composed of thousands of smaller organisms, known as Phobos Worms. A Phobos Worm can infect a target like a parasite, eventually taking control of the host body. The host is trapped in a form of Locked-In Syndrome, and the longer they are in this state the worse the feedback is when they are disconected from their host.

Hosts are connected to Mr Phobos via audio waves, as Mr Phobos and his possessed can both emit and understand extremely high frequency sound waves, allowing them to communicate without regular humans picking up on the audio waves. If a full-grown host is cut off from all 'Phobos Waves' for a period of time, it enters a 'panic state' in where it tries to complete all objectives given by Mr Phobos as quickly as possible. This could mean it launches into a violent rampage or desperately tries to protect a target with no self-preservation. This can be a problem if the disconnect is only temporary. If the disconnect continues, the Phobos Worm atrophies and the host regains control.

Shortfalls
Phobos Worms need to be applied onto an extremely weak willed host for it to have any effect. A host with even any will to survive can overpower the worm long enough to kill it by starving out the Phobos Waves. The nature of the host's control also means Phobos Hosts need to be in close proximity to Mr Phobos. Finally, Phobos Worms only live for 3 weeks, meaning the host will not last long. All of this combined with a crippling weakness to Fire that makes Phobos Worms terrible for mind control purposes.