TV-Series
Description
Brooke Walker, known as Umimi Habara in the original Japanese version, is a character who appears in the anime Yu-Gi-Oh! ZEXAL II. She is a professional Duelist and the wife of fellow pro Duelist Mayday Walker.

Brooke has a personal history connected to another character, Anna Kaboom. She was a friend of Anna and is a few years older than her, having been the one who originally taught Anna how to Duel. The relationship between Brooke and Mayday began with their wedding, an event that Anna attended. At the wedding, Brooke threw her bouquet, which was caught by Anna. The bouquet contained a card named Devoted Love, and Brooke told Anna that this card would help her find true love. Following their marriage, Brooke and Mayday became a professional Dueling couple.

In Yu-Gi-Oh! ZEXAL II, Brooke and Mayday are invited to participate in a Couples Duel tournament at the Heartland Academy Fun Fair. Prior to the tournament, while preparing her Deck, Brooke is approached by the villain Vector. The lights go out, and Vector brainwashes her, giving her the card Rank-Up-Magic Barian's Force to use against any holder of a Number card in the tournament.

At the tournament, Anna confronts Brooke, angry at her decision to quit Dueling. Brooke tries to explain her reasons, and the disagreement leads to a Tag-Team Duel. Anna forces Yuma Tsukumo to be her partner, and they face Brooke and Mayday. During the Duel, Brooke showcases her strategy, which involves using cards that support her husband's monsters. She summons her ace monster, Unsinkable Titanica, and later brings out Skypalace Gangaridai. Under Vector's influence, she draws Rank-Up-Magic Barian's Force and uses it on Gangaridai to summon CXyz Skypalace Babylon. She then gives control of this powerful monster to Mayday, instructing him to win the Duel no matter what, which confuses him as it is out of character.

After she and Mayday are defeated, Brooke collapses but is caught by her husband. The defeat frees her from Vector's control, and she retains memories of what happened while she was brainwashed. Following the Duel, she reveals the true reason for her planned retirement from professional Dueling: she is pregnant. In the English version, the reason is altered to her taking a break to teach. Later, she encourages Anna to pursue a relationship with Yuma, playfully pushing Anna toward him with the Dueling term direct attack.

Brooke has a close and supportive relationship with her husband, Mayday Walker. Their teamwork in the Tag Duel is highly coordinated, and Mayday uses a move called Xyz Move specifically to protect her. Her friendship with Anna is a key part of her story, as she was Anna's mentor and remains a figure Anna looks up to, even when upset. Her motivations center on her family: her desire to start a family with Mayday is the reason she steps back from her career as a pro Duelist.

In terms of abilities, Brooke is a skilled professional Duelist who uses a Deck themed around ships and the WATER attribute. Her past Deck includes Mermail monsters such as Mermail Abysstrite. Her known monsters include Unsinkable Titanica, Skypalace Gangaridai, and the Chaos Xyz monster CXyz Skypalace Babylon, which she summons using Vector's Rank-Up-Magic Barian's Force card.