|Name:||Marcelyn F. Mercury|
Great Conjurer of the Blue Blaze
|Date of birth:||November 5|
|Hobbies:||Traveling, the way of curry|
|Previous affiliation(s):||Magical Association, Ten Sages|
Maha☆Raja~ Curry Shop
|Previous position(s):||Zwei |
|Spin-off(s):||XBlaze – Code: Embryo |
XBlaze – Lost: Memories
|Japanese voice:||Chie Matsūra|
Marcelyn is an average woman with long pink hair and sky blue eyes tinged with emerald green. She wears a plain white-colored collar shirt with small black cape, long thin black cloth wrapped around the majority of her body. Her look is complete with oversized handcuffs, aqua-colored shorts, and pink slippers. While at work, her hair is tied up in a large bun. Also on two separate occasions, she wore a paper bag mask with a single eye hole for her to see through with a hole in the top for her hair bun to poke through.
Despite her numerous eccentric bouts of lectures about curry and it's mannerisms, Marcelyn is an intelligent woman who is perceptive and wise. She has no interest in the Blue since she believes it's power would make life boring by making the user omnipotent and omniscient; her philosophy on life dedicates itself to discovering things by oneself. Marcelyn also holds the view that "truth" is merely subjective.
Even when she was a member of the Ten Sages, she was extremely opinionated, never allowing herself to be constrained by the traditions of the Sages. She has a knowledge of mythology, using the mythical beast Pegasus in a poetic analogy for Drei's soul.
Marcelyn is Tōya Kagari's senior at his part-time job at the Maha☆Raja~ Curry Shop. She always passes mysterious comments about curry mannerisms towards Tōya. She is not much of a serious worker, which annoys him. 
Years before the events of XBlaze – Code: Embryo, Marcelyn was one of the Ten Sages with the title of Zwei. She taught Kuon Glamred Stroheim's mother and mentored Drei. Six years before Code: Embryo, she left the Magical Association for unknown reasons, and went to New Yokozaki City, working in Maha Raja under the alias of Ringo Akagi.
XBlaze – Code: Embryo
Marcelyn first appears when she begins to lecture Tōya on the mannerisms of one of the previous customers, noting said customers 'curry mannerisms' to be fairly good. After failing to attract his attention, she scolds him and begins a long lecture on how the customer had left his remaining food and cutlery. Her lecture ended as the manager reminded her that dishes needed to be washed.
When Tōya went to work again, he warned Marcelyn about the city becoming dangerous, leading her to tell him that him being enigmatic is the reason why he's in constant predicaments. While Tōya was busy working to help the huge number of customers, Marcelyn seated Es out of a rare bout of generosity and curiously asked the young man what her relationship is with him. For the rest of the night, she pestered him for information.
Quite a while later, Tōya arrived at Maha Raja with Mei Amanohokosaka. Marcelyn slyly waved off Mei's, true, accusations that she was a member of the Ten Sages. She then seated the duo as she remarked that the manager had slipped off to a strip club to kill time.
Later on, she found Drei, dying from wounds inflicted by Kazuto Kotetsu. She scolded him for constantly going on about the Ten Sages and about his philosophies. She watched as he died, and burnt his body to ashes to send him off. She jumped down into the sewer where Kazuto and Drei fought, finding the former succumbing to his wounds. Marcelyn quickly healed him and asked him to protect Tōya and his companions by clearing out the foot soldiers that could obstruct their path, reason being that she was in hiding and that she has no desire to fight on the front lines. It's unknown what she did after Maha Raja suddenly closed.
XBlaze – Lost: Memories
Two months after the Embryo Incident, it's revealed that Marcelyn returned to Ishana, continuing her position as a Ten Sage and becoming Kuon's mentor. Understandingly, she was unable to participate during the Vampire Incident, but told Kuon and Els von Klagen to give Tōya her regards, that she's doing alright, and she might visit again. This relieves and concerns Tōya, as he's happy that Marcelyn is alive and well, but doesn't want to deal with her curry obsessed antics again. After dealing with the Vampire Incident, Kuon and Elise return to Ishana where Kuon is eligible to become not only a Ten Sage, but also it's leader. With this, Marcelyn is now preparing her apprentice for her coronation as a Ten Sage.
Powers and abilitiesEven though she has spent numerous years away from the Magical Association and any form of combat, Marcelyn is constantly aware of her surroundings, having remained sharp throughout the years. One of her sorcery spells is Blue Requiem which summons powerful blue flames. While healing sorcery isn't her forte, she can do enough to temporarily patch up someone; she can fully heal people, but the process takes a fair amount of time.
- Main article: Marcelyn F. Mercury/Image Gallery
- 'Zwei' is German for two.
- Marcelyn's birthday, November 5, is the anniversary of Guy Fawkes Night, a holiday celebrated with fireworks in the United Kingdom, New Zealand, and in certain parts of Canada.
- The paper bag mask she wears in Lost: Memories is actually a reference to Guilty Gear fighter, Faust, who also wears the same paper bag mask, with the difference being that Marcelyn's mask is slightly modified with a hole on the top for her hair.