Ang'Jhu T'Radiak

Ang'Jhu T'Radiak started her life as Angelica Ryder, daughter of Nicholas Ryder and Julie Lei-Ryder in another reality in which the Federation had broken away from the Sol System, forcing Earth to make a strategic alliance with the Romulan Star Empire, forming a new organization - the Earth-Romulan Coalition or ERC as it was more informally known. 
Nick and Julie were killed as were most of the Ryder and Lei families when the USS Hope-B was destroyed by a rogue Reman attack. Angelica was the only survivor, as she was on Earth at the time having surgery for a damaged lung due to a virus she had contracted. Only three years old and the last of her family, she was adopted by the T'Radiak house as they had a deep friendship with Nicholas and Julie and their families. Her foster mother Shiarrael T'Radiak had named her Jhu, but she was used to being called Angel by other Terrans, so they simply called her Ang'Jhu - which basically was her name in both Terran Standard and Rhiannsu. 
Ang grew up in a mostly Romulan household, even choosing to have her ears tipped and a ridge surgically implanted in her forehead to more closely resemble her adoptive mother and her family. Shortly after Ang's 10th birthday her mother was killed by a Klingon during a border dispute and went to live with her Aunt who became her new adoptive mother, T'Kir, who was a Tal'Shiar operative.
Little is known about her teenage years, until she entered the Academy and like her counterpart was a prodigy who managed to graduate early and was already an Ensign before she was 18 years old. Quickly moving through the ranks and serving during numerous battles and wars, she eventually got command of a starship that was dubbed the Alth'Indor (or Phoenix) the pride of the ERC Fleet and eventually, despite only holding a Colonel's rank, had the command of over twenty other ships in a small Fleet tasked with protecting the former Romulan territory after the Hobus star exploded. 
She was due to be promoted to General when the the cross temporal and cross reality rifts began to open, she was in the middle of fleet maneuvers when a rift swallowed not only her ship but twenty two others and they found themselves in another reality with no way home.
Ang'Jhu quickly made sure that she and her people were treated fairly by this new Alpha Quadrant Alliance that was lead by her counterpart's father. A man she only vaguely remembered as a toddler, with a family that she never really met. At first she maintained an almost Vulcan like distance from them, but her counterpart was eager to bring her into the family and soon, Ang was like another sister to her and another daughter to Nick Ryder. She quickly formed a real attachment to them and revealed that she had some rather serious medical issues that were starting to slow her down. Many of her internal organs were transplants from Romulans due to some nasty injuries she sustained in the Battle of Gal'ador and the doctor aboard her ship was only used to treating full Romulans. But luckily her counterpart had a team of amazing doctors on Starbase Byron and they managed to not only repair her damage but also clone proper organs and tissue to make her more complete, as they had Angel as a template to work from.
When Angelica became pregnant with her first daughter, Trinity, Ang was appointed the new CO of Starbase Byron and once she returned from Maternity leave, Ang resumed command of her ship, but also of her Fleet, 
During an attack on the Presidential Compound by the Scions of Sol and Jackson - the evil counterpart to Jack Ryder, Ang was drawn in to help defend, but was presumed killed in action when her shuttle was bombed from one of Jackson's ships. BUT in another reality, the bombing of her shuttle was only a distraction to beam her onto one of their ships and try to gather what intel they could from her. In the 'main' reality, Ang'Jhu is dead, but in another... they never recovered her body. 
Ang had spent over two years in a Scion ship as a prisoner and then was transferred to one of Bellatrix's ships that was sent to the Romulan Republic's system to survey planets, but crash landed on a barely M class world. During that time she was welded into an old training droid's head and kept as a prisoner while they attempt to gain access to her Romulan intelligence and her network, in an attempt to turn the Romulans against the rest of the Alliance, much like they had kept relations with the Klingons tense.