User blog comment:Roinelll/GEN - Cameos/@comment-1419424-20150727015350

Nanako (normal timeline):  Born in 2053. As of 2072 she is not a God Eater. She is currently still at the Glasgow Branch as part of their R&D department.

Nanako (alternate timeline/The Maxim of Possibility): Due to Sigma infusing himself into her at the time of the Gehenna's attack in 2067, she is half-Aragami and can use Sigma's God Arc, which is in fact (in her case) Sigma himself. She lost an eye somewhere along the way (which she now covers with bandages) and now leads a band of survivors, including a number of God Eaters, to fight back against the Gehenna and the Neo Aragami. Her Blood Arts in this timeline are Ray Aurora ∑, a beam of energy fired from her covered-up eye, and Goddess Blade ∑, a technique wherein she produces countless blades from the Oracle cells in her body and launches them at her target. Her physical capabilities are obviously augmented by being half-Aragami. Additionally, her battle experience from fighting the Neo Aragami combined with her experience as the head of her group of survivors makes her both a formidable leader and a fighter capable of thinking on her toes and adapting to any situation.

Sigma:  Born in 2042. You have a number of options here. You can take him from the normal timeline or from his version from GE:U due to his time travel abilities. In the normal timeline, he is merely an Aragami-human hybrid organism who can shift his body into any shape and devour without a God Arc. His God Arc is produced from within his body from his own Oracle cells, much like Nanako's in TMoP. He possesses the same Blood Arts as TMoP Nanako, with the sole difference being that Ray Aurora ∑ is fired from his hand rather than his eye. He possesses heightened strength and speed befitting an Aragami.

Idenn:  Born in 2098 (22 years old). 2072 stats do not exist, but you can feel free to use her from any point in GE:U (pre- or post-Horizon). A God Eater with no Aragami component but possessing immense battle experience from fighting the Boundary Aragami in the future. Her Lifespring Blood Art enables her to send matter forwards or backwards in time, including herself if used on herself. As of her travel to the Horizon, she no longer has a God Arc, but can use Lifespring without a God Arc anyway. Physical capabilities are average for a God Eater.

Willard Knox:  Born sometime around 2160 or so. Age 23. Is the sole human being remaining on earth after the last of the humans in the Underground City (Wif's fic) and all of his own comrades died. Average strength for a God Eater, maybe slightly above-average. Has been fighting the Aragami since he was 12, so possesses abnormally high battle experience. Does not have a bracelet, but does not need one because his father, whose God Arc he uses, used a Bias Factor that is compatible with Will's genetic code. Lost his left arm and right leg in an Aragami attack, but crafted highly-advanced prosthetics to replace them. As for further details... I'll have to tell you via PM in chat :P