Sylvia Christel (シルヴィア・クリステル) is a main character in the No More Heroes series. She was an agent of the United Assassins Association, since raised in France, and Henry Cooldown's ex-wife. Described in official literature as "mysterious" and "cold," she provides ranks and sets up ranking maws for UAA members. By Travis Strikes Again, Sylvia marries Travis and has two children named Hunter and Jeane.

She appears one last time after the credits at the end of the first game with Jeane, in front of a painting depicting Travis' showdown with Henry. Her name is an allusion to Dutch actress Sylvia Kristel, referred to as the "Tangerine."

Sylvia wears a multitude of clothes, ranging from sleek and sexy, to thin and revealing. Due to the provocative clothing she wears, Travis tends to stare at her cleavage and her thong, with Sylvia acting indifferent and cold. There are multiple occasions where Sylvia is seen naked as well. In "No More Heroes: Desperate Struggle," Sylvia changes her hairstyle from wavy to long and smooth. Like in the previous game, Sylvia continually wears really revealing clothing. At one point in the game, when the player visits the U.A.A. building for the first time, the scene opens with a picture of Sylvia's butt jiggling as she walks down the hall with Travis following behind her and looking at her g-string thong sticking out of her pants. She is seen wearing a bikini at times and sometimes wears skintight yoga pants which show her g-string thong underneath. She is also said to be the hottest woman alive.

Sylvia is a very powerful and manipulative woman through out the series, able to continually get away with conning people (as told to Travis by her mother before the 1st rankings fight in NMH1) and organizing the rankings battles. She's been shown to have some level of high charisma mixed with that, able to use her charm and flirty nature to make Travis (and possibly other participants as well) go out of his way to attend fights she sets up, and use it for levels of business as well. She is able to play the game by her rules, when she wants at a whim, having made them in the first place, and could be considered one of the most dangerous characters in the series, even without the ability to fight.

She's cold and indifferent towards others when she feels (more notably shown before ranking fights during NMH1 while she and Travis are on the phone together.), and occasionally outright cruel and jealous.

Although when she's feeling it, she's been able to show off a more softer and even protective side of herself.

For reasons unknown, Sylvia is able to fly and shoot lasers out of her eyes in No More Heroes III.

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At the time, even though she was married to Henry, she continually flirts with Travis Touchdown, and even promises she will sleep with him if he reaches the top of the rank, though she also threatens to kill him if he ever makes her jealous. She also kisses Travis after he kills Harvey Moiseiwitsch Volodarskii.

Later in the game, she calls Travis on the phone and confesses that she has fallen in love with him, although statements made by her mother to Travis hint otherwise.

Sylvia is a constant flirt toward Travis for nearly the entire game. However, it is moreso in a sadistic and manipulative matter, rather than in a legitimate sense.

After Travis defeats Death Metal, Sylvia entertains the possibility of having sex with Travis if he reaches Rank 1.

Sylvia takes Travis out on a date to see Harvey Moiseiwitsch Volodarskii onstage, and to witness the battle between them.

If Travis dies during the battle with Harvey Moiseiwitsch Volodarskii, Sylvia concernedly cries out "Travis!".

When Travis defeats Harvey and ascends to Rank 4, he and Sylvia kiss onstage.

In the pre-fight phone call to Travis, Sylvia shows legitimate concern towards Travis' safety, telling him to come back safely, as opposed to her usual pessimistic percentage estimate of Travis' death.

It's revealed by Sylvia's mother that Sylvia is a professional con artist, and was using Travis the entire time for financial gain.

Sylvia pours her heart out over the phone to Travis, telling him that she always loved him, despite his stupidity, ignorance and uncouth attitude.

The previous evidence makes it quite likely that all evidence of the relationship was expertly faked by Sylvia.

It's revealed that Sylvia is, and always has been, married to Henry, though later in No More Heroes 2, she mentions that she divorced.

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There's not much told about Sylvia and Henry's feeling's towards each other, due to their lack of interaction in game, but he does reveal during him and Travis's fight in No More Heroes that they were married and had been for a while, shown off when Travis mocks him about 'having slept with her' and him acting surprised about this information.

In No More Heroes 2 Sylvia reveals between the two titles they had gotten divorced.

Upon Travis' defeat of Death Metal, Travis proposes that if he gets to Rank 1, Sylvia will have sex with him "Just once". Sylvia nonchalantly says "Maybe, maybe not".

In No More Heroes 2: Desperate Struggle, when the phone conversations are going on, her name tag says her name is Linda.

Sylvia Christel meets Travis Touchdown in the Death Match bar of Santa Destroy, where she ushers him into joining the United Assassins Association, so long as he can qualify by killing the eleventh ranked assassin, Helter-Skelter. Touchdown succeeds, and after moving on and slaying the tenth ranked assassin, Death Metal, Touchdown proposes that if he reaches first rank, Christel will have sex with him. To this, Christel nonchalantly says "Maybe, maybe not."

Though she is evidently married, Christel continually flirts with Touchdown in a somewhat sadistic way, and even threatens to kill him if he ever makes her jealous. She accompanies Touchdown to his Ranking Battle against Harvey Moiseiwitsch Volodarrskii, which she passionately dubs a date. After killing Volodarrskii, Touchdown and Christel even share a kiss. Alternatively, if the player is killed in this Ranking Battle, Sylvia concernedly cries out Travis' name.

This change of heart towards Touchdown continues through his next Ranking Battle against Speed Buster, where in a cellphone call she shows legitimate concern towards his safety, telling him to come back safely, as opposed to pessimistically giving her usual percentage estimate of how likely Touchdown is to die. After the conclusion of Touchdown's match with Bad Girl, however, Christel does not appear to greet him with the disposal crew Talbot and Weller, as she had after the preceding nine matches. Touchdown soon learns by calling the UAA phone number given to him by Christel that the number actually belongs to Sylvia's mother, and that the UAA does not exist, being a ploy Christel, a professional con artist, has used on many others before Touchdown to exploit their finances. Mrs. Christel persuades Touchdown to finish what he started and go through with the final "Ranking Battle" anyways, before which Sylvia calls him one last time, confessing that despite his stupidity, ignorance and uncouth attitude, she has fallen in love with him. Although she doesn't greet him after his final battle, it is revealed that Christel was in fact watching from a distance. Touchdown later learns that she had married his estranged twin brother Henry "about 10 years ago" during their college years (though since Sylvia is only 24, she would have had to have been in college and married to Henry when she was 14).

Sylvia Christel appears in No More Heroes 2: Desperate Struggle, set three years after the conclusion of the first game. By this time, Travis Touchdown is seeking revenge for the death of his best friend, Georgy Bishop, and rejoins the UAA with this principal purpose.

Here, Sylvia's love-hate relationship grows even stronger with him and she apparently shows legitimate concern towards him. Sylvia's changing personality is much evident in this game, at first showing care and important advice to Travis one second, then becoming a complete ice queen the next. She also assists Travis in exacting his revenge for the murder of his best friend, Bishop, by notifying him of who killed Bishop and that the number one assassin was behind the hit. Although Sylvia points out on more than one occasion that assassins are supposed to kill one another, as stated by the rules of the UAA, it is revealed that she stopped Travis and Henry from killing one another, contradicting herself for Travis's sake.

She also seems to be crazy about fashion, as she is constantly changing her hairstyle throughout the game. She also cares much about beauty and health, in some occasion she is seen working out. Travis and Sylvia fight over the rules of the UAA on multiple occasions, as shown in the fights with Ryuji and Captain Vladimir, yet they both can't seem to stay away from each other, no matter how much they disagree. It is revealed at the end of the game that Sylvia is in fact the narrator of the game. This could mean that Travis did actually destroy the UAA, she quit, or the UAA had no more funds to keep it running due to Jasper's (and subsequently, Pizza Batt's) destruction.

Sylvia does not make an appearance in the initial release of the game, but the third cheat listed in each of Carlos Setagaya's magazine articles purports that secret recordings from her can be obtained if the player completes absurd (and oftentimes impossible) tasks.

Sylvia later made her appearance in the April DLC scenario for Travis Strikes Back. Here, she is revealed to have married Travis after the events of Desperate Struggle, revealing that the "wife" Travis mentioned in the game was indeed Sylvia. The game also reveals that Jeane's father is none other than Travis himself. It is also revealed that they also had a son as well, named Hunter. It is possible that one of their births (or both) were a result of Travis losing his virginity in No More Heroes 2.

Some possibly unexplained mysteries concerning Sylvia were introduced in the second game, least of which was her promise to Shinobu in return for her defeating two ranked assassins for Travis. More glaringly, hints to what sounds like her indestructibility are to be found. When Shinobu threatens to kill her if she were to break her promise, Sylvia casually tells her, "You cannot kill me, silly." Additionally, upon Travis' ascension to 2nd Rank, Travis accidentally seared Sylvia's hand with his beam katana, yet she doesn't even flinch.

In No More Heroes 3, Sylvia inexplicably can fly through space, as well as being able to fire laser beams from her eyes.

There are a number of Sylvia Christel trading cards in the Design Materials set. These include "Sylvia Christel" Front / Back, "Sylvia Christel" Side, "Sylvia Christel" Expressions, Sylvia Christel PR Illustration A, Sylvia Christel PR Illustration B, Sylvia Christel and Travis Touchdown & Sylvia Christel.