Julie-Su (Light Mobius) was the Light Mobius universe counterpart of Mobius Prime's Julie-Su. Her cybernetics were removed when Knuckles became Chaos Knuckles once again and used his powers to make her completely organic. She eventually married Knuckles, though unofficially, and the two had a daughter, Lara-Su. She has since taken her role as a mother very seriously, looking out for her daughter whenever she can, and helps her husband where ever she can.
Julie-Su had developed a much gentler and more maternal personality, showing great support and compassion for her husband, Knuckles, and her daughter, Lara-Su. She took her role of parenting very seriously, and often had to remind Knuckles on parenting tactics to deal with their rebellious daughter. Because of her help, Knuckles was able to convince Lara-Su to attend her Unveiling ceremony. Following this she had a mother-to-daughter discussion about why she was so over protective. (StH: #131, #132, #133)
Julie-Su later made all the preparations, with help from Abby, for King Sonic and Queen Sally's visit to their home. She, Sally and Lien-Da discussed at length how difficult it was to satisfy everyone's appetite and to convince Sonic and Knuckles to attend social gatherings. She later spent time talking to Queen Sally while their husbands and children played in the pool. (StH: #139)
In the altered timeline, Julie-Su was still a worried mother over her daughter's safety, and Knuckles commented that she would probably flip when she found out that Lara-Su took on the former king, Shadow, and won. (StH: #167)
Five Years Later...
Five years afterward, Julie-Su and Knuckles leave Lara-Su in charge of things while they were away in Mazuri. When Julie asked if she was sure she could handle it, Lara reassured them both by saying that she is "ready for anything". She and Knuckles went with Vector and Mace to deal with the Mazuri Separatists and talk to someone called "Bill." (SU: #4, #5)
In the Unaltered Timeline, aside from a few scenes where she was seen wearing a bathing suit at pool side, Julie-Su had developed a slightly more feminine look, although still with a tomboyish touch. She was seen wearing a blue colored sleeveless top, and gray shorts and boots, with the legs on the bottoms stopping just above her knees. Her hair was much longer and more femininely styled, and her dreadlocks were much longer, as well, with fewer cybernetic attachments. (StH: #131).
It is unsure if Julie-Su had kept up to practice, in the future, with her combat training.