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Anime and Manga
- Two agents in Kiddy Grade are named Dextera and Sinistra (right and left hand, respectively).
- Lumis (light) and Umbra (shadow).
- 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.
- Yu-Gi-Oh! ZEXAL: The tag team partners Gauche (left) and Droite (right).
- Omegamon and Alphamon from Digimon. Omegamon is white, Alphamon is black.
- In Digimon Adventure, there are Angemon and Devimon, and Angewomon and LadyDevimon.
- In 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 Izanagi and Izanami, named after the parents of the gods Susano'o, Amaterasu and Tsukuyomi. Izanagi is a Reality Warper, while Izanami directly counters Izanagi users.
- The two main characters of Ano Ko ni Kisu to Shirayuri wo 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 paradoxical dynamic.
- The twin princesses Dawn and Eve in the Xanth series.
- Conjoined Twins Nora (noir/black) and Blanche (white) Olney from Shelley Jackson's novel Half Life. Their middle names are Gray and Grey respectively.
- Lords and Ladies 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 (a lady of negotiable affection). She named her sons after vices, such as Anger (a kind and nonviolent man), Bestiality (very kind to animals), and Deviousness (an honest and straightforward chap).
Live Action TV
- Kath Day and Kel Knight of Kath and Kim. Kel tries to propose by asking Kath if she'd like to "turn Day into Knight".
- Sideways' Mini-Cons from Transformers Armada 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 head when he 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 Final Fantasy X, 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 Ghost Trick 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 Devil May Cry are 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.
- 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").
- The two heroes of Kalos in Pokémon X and Y are Dexio and Sina, from the Latin for 'left' and 'right'.
- Minor character couple in The Wotch: Scott Winters and Julie Summers.
- Dawn and Dusk from webcomic Gene Catlow.
- 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.