BACKGROUND
Feldt was orphaned in childhood due to an unexplained accident in which one of earlier Gundams was involved. One could say she's been involved with Celestial Being since birth- both of her parents, Marlene Vlady and Ruido Resonance were 2nd generation Gundams pilots working for Celestial Being. Since one of CB’s rules is not to reveal any personal information, Feldt doesn’t have much knowledge regarding her family’s death. She can only cherish the memories she has about them and mourn their death on the anniversary of the accident. Feldt's loss makes her similar to Lockon, whom she admires and to whom she opens the most.
Not much is know about Feldt herself. She was probably raised by CB's members and during that time she acquired knowledge that makes her useful to Sumeragi Lee Noriega. It isn't impossible that her parents taught her, as she mentions that they never told her about existence of the Throne Gundams.
Despite her young age Feldt followed in her parents’ footsteps- working for Celestial Being as a tactical operator, along with a fellow “bridge bunny” Christina Sierra under the orders of Sumeragi.
As a crew member Feldt's irreplaceable as she possessed wide knowledge of programming, mechanics and engineering. Her job is to monitor missions and provide tactical support to the Gundam pilots. She also does thorough research regarding their next tactical objects. One of the most important tasks she carried out along with Christina was developing an independent operating system for Gundams after the truth about Veda being hacked was revealed.
After the final battle she stays with CB helping with it's resurrection on a new Ptolemy's bridge.
PERSONALITY
Feldt is very quiet and retiring person. That's the first thing one can observe while being around her. As a tactical operator she's very reliable and treats her duties seriously. Procrastination doesn't exist in her dictionary and her calmness, competence and diligence are a great asset for the organization.
However, human interactions are definitely not her forte and most probably she finds it easier to process data or interact with robots like Haro than to socialize with the crew.
At the same time she's a very kind hearted person and when she eventually gets close to someone she truly cares for them. This works both ways- she's liked by her teammates and it was only thanks to Christina's lie that she survived the final battle along with miss Sumeragi.
With passing time Feldt remains her quiet self, but she learns to slowly open up and appreciate life, mostly thanks to Lockon's and Christina Sierra's influence. She becomes "softer", as miss Sumeragi noticed and pointed out to her.
Feldt seems to care very little about girly things such as shopping but she lets Christina, who is her exact opposite, take her to shops each time they leave the orbit, even though she'd rather be analyzing mission plan. She doesn't share Christina's enthusiasm when it comes to dressing in cute clothes. What she does enjoy is the nature.