When the brawlers ended up in the Doom Dimension with Dan, she tackled him to the ground as usual, but didn't seem happy to see them, at first. They battle Masqerade and lose to him on purpose to find Dan which they do. She, shun runo and Marucho then device a plan to save Dan. She watches Dan's match against Masquerade and tries her best to encourage everyone after he was sent to the Doom Dimension with Drago. When Billy was defeated by Masquerade, somehow Julie sensed that something was and wrong, and it was proven true when Joe Brown told everyone about what happened to them. Through the series, she tackles or bear hugs Dan whenever he wins a brawl, ticking off Runo such as after he beat Chan Lee and Julio Santana. And that's exactly what he did, and Julie was very happy she got her childhood friend back. Fortunately, Julie was able to convince Billy otherwise, because after she gives him the toy cowboy that he gave her back when the two were children, Billy realized he'd rather quit Masquerade's team and join the Brawlers than lose his childhood friend and her Gorem. This leads to another brawl between the two and almost leading her and Gorem to be banished to the Doom Dimension forever.
She states that she would do anything to free Billy from Masquerade's grip. In Julie Plays "Hard Brawl", she follows Dan around since she is still upset over Billy, which resulted in Runo calling her a "dog". By the end, they pulled it together and defeated them both. In their battle, she lost both Tuskor and Rattleoid (although they later reappear ), and nearly lost Gorem though with Shun's help, he was saved. She and Shun Kazami challenged Komba O'Charlie, his neighbor, and Billy. When she discovers that Billy had joined Masquerade, she is crushed by this fact. Gorem befriended her, and together, they defeated Billy in a rematch. After returning to her room, in her depression, she started crying, until a Bakugan named Gorem spoke to her. On a day off from school, she spent the whole day looking for one, almost getting stung by scorpions, bitten by venomous spiders, and falling off a steep cliff, with absolutely no results. She makes her first in-person appearance battling her childhood friend Billy and being defeated easily due to the appearance of his talking Bakugan, Cycloid, making her upset that all her friends had talking Bakugan. In the beginning of the series, she only made appearances chatting with the other Battle Brawlers in a chat room on the site, and would usually be eager to hear if Dan had won any battles or not.
In both New Vestroia and Gundalian Invaders, she advises Mira Fermin and Jake Vallory, the brawlers that filled the Subterra positions in the Battle Brawlers, how to properly brawl in their element. She tries to help out and give helpful advice whenever someone needs it. However, in episode 47, "Here's Mud In Your Eye", after Julie realizes she likes Billy Gilbert, and the two becomes a couple, she and Runo went on to become best friends. Because she saw herself as Dan's number one fan, she and Runo Misaki often clashed out of jealousy. She is bubbly, extroverted, and adores Dan (whom she calls "darling" in the Japanese version, but now calls him in his real name since Season 4). She may come off a bit scatter-brained, but Julie can compete with the best Bakugan brawlers. In Mechtanium Surge, Julie wears a black tank top with a pink jacket. She wears a pink waitress uniform as well as a cheerleader's. In Gundalian Invaders, Julie's outfit changes to a dark blue belly shirt and sometimes a green jacket. In New Vestroia, Julie wears a bleached rainbow half-shirt with red shorts, white beach shoes and a red scrunched and a gold heart hair clip, unlike the gold scrunched and pink hair clip in the original season. She wears white boots that matches her white gloves.
She wears headphones and a portable music player attached to her right shoulder (but is rarely seen listening to it). In Bakugan Battle Brawlers, she wears a pink midriff-baring outfit with white fingerless gloves that covers her forearms. She is particularly fond of leaving her midriff (belly) and long legs completely exposed. Julie enjoys dressing immodestly (particularly to attract boys), always wearing clothes fit for summer months. Julie is a young, pretty girl with very tanned skin, long, pinkish-white hair that is always in a side ponytail, and blue eyes.