OppositesThemeNaming a variation of ThemeNaming using a set of names within a work that create a theme by using words that are opposite to each other or act as foils to each other. Authors like to use themes to create a sense of unity or cohesiveness within their work. Some extend themes to the names of the characters, often beyond the similarities that would be expected for characters from the same culture or who all speak the same language. When the author does this, you have ThemeNaming.

Using OppositesThemeNaming puts the named persons in strong contrast to each other. Sometimes it is used to set up the characters as enemies or foils to each other, though it may also signify that they balance each other in a way that is complementary and productive rather than antagonistic. Other times it simply serves to provide symmetry in the names without actually signifying anything about the personalities or relationships of the characters.

This often overlaps with ThemeTwinNaming, especially with PolarOppositeTwins.

[[AC:{{Anime}} and {{Manga}}]]
* Two agents in ''Anime/KiddyGrade'' are named Dextera and Sinistra (right and left hand, respectively).
* Lumis (light) and Umbra (shadow) from ''Manga/YuGiOh''.
** The two famous dragons Blue-Eyes White Dragon and Red-Eyes Black Dragon play this trope twice. And their upgraded versions Blue-Eyes Shining Dragon and Red-Eyes Darkness Dragon. It's mentioned, that Blue-Eyes has more power while Red-Eyes has more potential.
** Many other cards are have this kind of theme naming.
* Omegamon and Alphamon from ''Franchise/{{Digimon}}''. Omegamon is [[GoodIsNotSoft white]], Alphamon is [[DarkIsNotEvil black]].
** In ''Anime/DigimonAdventure'', there are Angemon and Devimon, and Angewomon and [=LadyDevimon=].
* In ''Manga/{{Naruto}}'', the Mangekyo Sharingan has the two jutsus Tsukuyomi and Amaterasu, named after the two Shinto goddess of moon and sun, respectively. Also, the Sharingan has the forbidden jutsus [[spoiler:Izanagi and Izanami, named after the parents of the gods Susano'o, Amaterasu and Tsukuyomi. Izanagi is a RealityWarper, while Izanami directly counters Izanagi users]].
* The two main characters of ''AnoKoNiKisuToShirayuriWo'' are named Shiramine Ayaka (shira meaning "white") and Kurosawa Yurine (kuro meaning "black") − although ironically, despite their names Ayaka is black-haired while Yurine is blonde. Their names also have the exact same number of syllables, with the first name written in Hiragana. And if you push even further (but it might be coincidental there), Ayaka has a last name ending in [ine] and a first name ending two [a]; Yurine has a last name ending with two [a] and a first name ending in [ine]. So you could say their very names highlight their [[OppositesAttract paradoxical]] [[BirdsOfAFeather dynamic]].

* The twin princesses Dawn and Eve in the ''Literature/{{Xanth}}'' series.
* ConjoinedTwins Nora (noir/black) and Blanche (white) Olney from Shelley Jackson's novel ''Half Life''. Their middle names are Gray and Grey respectively.
* ''Discworld/LordsAndLadies'' has a character whose mother tried to follow the tradition of naming daughters after virtues, but got very confused about it: her daughters had the names of virtues, so she reasoned that her sons should have the names of vices. Meanwhile, all her children completely lacked the traits they were named for. Her daughters had names like Charity (a miser), Hope (chronically depressed), and Chastity ([[UnusualEuphemism a lady of negotiable affection]]). She named her sons after vices, such as Anger (a kind and nonviolent man), [[BestialityIsDepraved Bestiality]] (very kind to animals), and Deviousness (an honest and straightforward chap).

* Kath Day and Kel Knight of ''KathAndKim''. Kel tries to propose by asking Kath if she'd like to "turn Day into Knight".

* Sideways' Mini-Cons from ''Anime/TransformersArmada'' are named Rook and Crosswise, but their Japanese names are Bright and Shadow respectively. However, they are both evil, though Sideways wears Rook (Bright) as a [[CombiningMecha head]] when he [[DoubleAgent poses as a benevolent Autobot]] and Crosswise (Shadow) when acting evil. In the toy's original release, it was the opposite way around (Shadow represented good, Bright evil), but due to an animation error in the anime wherein the animators accidentally used the wrong head, a running change was made to the toy to switch the Autobot and Decepticon faction symbols around.

* In ''VideoGame/FinalFantasyX'', the main couple is named oppositely: Tidus is a romanization of "Tidaa", which is Okinawan for "sun"; Yuna, on the other hand, is Okinawan for "night".
* The two blue-skinned assassins in ''VideoGame/GhostTrick'' are named Jeego and Tengo. Jeego's name comes from 'jigoku', and Tengo's name from 'tengoku', Japanese words meaning 'hell' and 'heaven', respectively.
* Trish's twin handguns in the ''Franchise/DevilMayCry'' are [[ICallItVera named Luce and Umbra]] ("Light" and "Shadow" in Italian) and are appropriately colored.
** Dante's handguns are named "Ebony" and "Ivory."
* ''Vocaloid'' has Rin and Len Kagamine. Their names are a pun on the words "right" and "left", respectively.
* ''Franchise/{{Pokemon}}'':
** Plusle and Minun, named for positive and negative electrical charges.
** The energetic Vigoroth ("vigorous") stands in stark contrast to its younger and older forms, the exceptionally lazy Slakoth and Slaking (as in "slacking off").

* Minor character couple in ''TheWotch'': Scott Winters and Julie Summers.
** This is doubly thematic: first the contrasting seasonal elements, but secondly, if you switch the last names you get the names of Cyclops from the Franchise/{{X-Men}} and Julie from ''ComicBook/TheMaxx''. Whether this ''means'' anything, though...
* Dawn and Dusk from webcomic ''GeneCatlow''.

* In ''WesternAnimation/AvatarTheLastAirbender'' TheHero Aang and his initial ArchEnemy[=/=]TheRival Zuko had names on polar opposite ends of the alphabet. This pattern was repeated with Zuko and his more evil sister, Azula. Also, Azula and Aang have this same pattern in the second letters of their names.
* ''WesternAnimation/{{Gargoyles}}'' has Demona and her daughter Angela. In an odd twist, the fact that they have opposite theme names is just a coincidence; when Macbeth gave Demona her name in 1040, he had no idea that Demona had an unhatched child who would later be named Angela; and when Angela hatched in 1058 and the Magus, Katharine, and Tom named her, they had no idea that her biological mother had been named Demona.