Darren

Darren is the Dark Phoenix alter-ego of Blaine Anderson.

This personality formed due to decades of brainwashing and torturous abuse by the hand of Blaine's mother Ariana. After an oracle foretold that Blaine would be the end of the phoenix species, due to her malignant paranoid personality disorder, Ariana felt compelled to prevent her son's descent into darkness by any means she could imagine. The abuse caused Blaine to lock away any and all aggression and negative emotions into the furthest depths of his mind where they coalesced into a fully formed personality.

Only in recent months has Darren managed to manifest fully and struggle for dominance over the body he shares with Blaine, namely after the first time Blaine used his power out of anger. He seems to desire  absolute control and the complete destruction of high lighter counterpart.

However, strictly speaking, Darren is not a true Dark Phoenix because he is only one extreme facet of Blaine's overall personality that has been amplified. As long as the two personas exist separately, Darren cannot become a true Dark Phoenix, even if he manages to destroy Blaine's personality. The only way he can become one is in the event where the two personas rejoin fully with him in dominance. Otherwise, he will remain an incomplete personality. Likewise, if Blaine were to manage to destroy Darren's personality, he too would be an incomplete personality. If one of the personas is destroyed, eventually their body would wither and decay.

When Darren takes control, it can be noticed by a change in eye color. Usually, they are an amber-brown, but Darren presents with anything from a pale, flax yellow darkening to black, darkening in respect to the more control he has over their body. When black, the color can sometimes spread past the irises into the the sclera, or white of the eye. He also tends to be more powerful than Blaine, though that usually is due to the fact that where Blaine has fearful restraint, Darren lacks any.