Arthurian Bones Under a Fantasy Skin
Most anime name their characters either in Japanese or in generic fantasy syllables. Nanatsu no Taizai does something more deliberate. Nakaba Suzuki built the series on an Arthurian skeleton — Meliodas from Meliadas the Cornish king, Merlin from Camelot, Escanor from the Vulgate Cycle's Sir Escanor the Large — and then layered different naming traditions on top depending on how supernatural a character is. The closer to mortal and institutional, the more European medieval their name sounds. The closer to ancient and divine, the stranger and more celestial it gets.
That structure is the key to building a believable OC for this world. Get the faction right and the name follows naturally.
Holy Knights Sound Like They Work for a Government
Gilthunder. Dreyfus. Hendrickson. Howzer. These don't sound like fantasy names — they sound like surnames on a military personnel file. That's intentional. The Holy Knights of Liones are an institution, not a legend. They have ranks, salaries, political allegiances, and corruption scandals. Their names carry that institutional weight: Germanic, slightly formal, the kind of name you'd find on a decree or a tax roll.
- Germanic/French medieval roots
- "-er", "-on", "-us" endings
- Compound forms (Gil + thunder)
- Feels like an old European surname
- Angelic "-iel" suffixes (that's Goddess territory)
- Single dramatic syllables (that's Sins territory)
- Floral or nature names (that's Fairy territory)
- Anything that sounds mythologically famous
- Gilthunder — gilded authority
- Griamore — echoes "grimoire"
- Guila — soft, feminine, still fierce
- Jericho — biblical surname energy
When building a Holy Knight OC, resist the urge to give them an impressive fantasy name. The most memorable knights in the series — Dreyfus, Hendrickson, Howzer — have names that feel almost too ordinary for people with their power level. That contrast is the point. Institutions grind down the mythic. A Holy Knight's name should feel earned through bureaucracy, not destiny.
The Sins Names Carry Old Arthurian Weight
Naming a character after Arthurian legend isn't decoration — it's a load-bearing structural choice. When Suzuki named his dragon sin Meliodas, he picked one of the most ancient and obscure names in the Arthurian canon, a Cornish king from a pre-Geoffrey tradition. That's not an accident. The Seven Deadly Sins are supposed to feel like they've been around forever, like figures out of myth who somehow ended up running a tavern.
Escanor — a man so ancient-sounding he had to be the one who hates the sun
For OC characters at Sins level, fish from the same Arthurian pool: Round Table knights, Breton legend figures, Celtic warrior names. Avoid modern coinages and avoid anything that sounds invented. If you wouldn't find it in a footnote of Thomas Malory, reconsider. The Sins should sound like they walked out of a different, older story and got lost in this one.
What Sets the Goddess Clan Apart
The "-iel" suffix is doing serious heavy lifting across the Goddess Clan. Ludociel, Sariel, Tarmiel — that suffix connects them directly to Jewish and Christian angelic tradition (Sariel is literally one of the seven archangels in the Book of Enoch). For high-ranking Goddess Clan members, that suffix signals both faction membership and power tier.
Elizabeth is the exception that illustrates the rule. She's ancient divine power trapped in a mortal body, cycling through reincarnation. Her name sounds European and human because she is human — the goddess is buried inside. When building a Goddess Clan OC, ask whether they're fully divine or caught between worlds. Fully divine: use the "-iel" tradition. Mortal reincarnation: pick something historically royal that sounds like it belongs in a cathedral portrait.
Demon Names: Beautiful or Dangerous, Never Both by Accident
The Ten Commandments reveal something uncomfortable about the naming conventions in this world. Estarossa sounds graceful, almost romantic. He was designed to sound that way — because Estarossa is Mael, a fallen archangel whose real name and identity were stolen and twisted. Fraudrin contains "fraud" in plain sight. These aren't coincidences.
- Use sharp consonants (z, k, dr, gr) for demon soldiers and commanders
- Hide meaning in Commandment names — reflect their granted power
- Let upper-rank demons have strangely beautiful names (it signals danger)
- Keep names short to medium — demons don't need to impress with syllables
- Use "-iel" suffixes for demons (that's Goddess Clan territory — unless deliberately stolen)
- Give low-rank demons names that sound legendary or mythic
- Stack harsh consonants randomly — the texture should feel intentional
- Forget that beautifully-named demons are usually the most dangerous ones
Fairy Names Are What the Forest Would Name Itself
Gloxinia is a genus of tropical flowering plants. Elaine comes from Old French "bright, shining one." Harlequin — King's true name — is theatrical, playful, and older than it looks. Fairy names in this series feel chosen by something with long memory and no urgency. They're not warrior names or institutional names. They're names the forest would give you if you waited long enough.
Short fairy names (Elaine, Oslo) feel more fey and elusive. Longer floral names (Gloxinia) feel like the fairy has been around long enough to be named after something that blooms slowly. Both work — pick based on how ancient your character is supposed to feel within the clan's hierarchy. If you're building characters for other fantasy anime settings, the Rising of the Shield Hero name generator covers another world where demi-humans and fantasy races each carry distinct naming traditions worth studying.
Common Questions
Do Holy Knight OCs need Arthurian names?
No — that's actually the wrong direction. Holy Knights in Nanatsu no Taizai carry Germanic and French medieval-style names (Gilthunder, Dreyfus, Hendrickson), not Arthurian ones. Arthurian names are reserved for the Seven Deadly Sins themselves, who are ancient legendary figures rather than institutional soldiers. If your character serves a kingdom and has ranks and duties, give them a surname-style European name. Arthurian names signal mythic weight that a regular knight hasn't earned.
Can I use the "-iel" suffix for a demon character?
Only if there's a story reason. In canon, Estarossa is secretly Mael — a fallen archangel whose Goddess Clan identity was suppressed. His beautiful name is a clue hiding in plain sight. If your demon OC has a "-iel" name, that should mean something: they were once Goddess Clan, they've stolen a divine identity, or they're a hybrid. Using the suffix without that context muddies the faction signals the series builds so carefully. Demons with "-iel" names should make readers ask why.
How should Giant Clan names differ from Holy Knight names?
Giants carry names that feel ancient and elemental rather than institutional. Diane comes from Diana, the hunting goddess — a name that predates the kingdoms of Britannia entirely. Matrona is Latin for "great mother," an archetype older than any king. Where Holy Knight names sound like they belong on a duty roster, Giant Clan names should sound like they belong on a standing stone. Think Latin and Greek roots, short to medium length, sounds that could be geological features as easily as personal names.
What makes a name feel "Seven Deadly Sins level" rather than just fantasy?
Arthurian age. The Sins' names feel legendary because they are — pulled from a tradition that's been in circulation for over a thousand years. If you're naming an OC at that power and story level, look at the Vulgate Cycle, the Mabinogion, Breton lai characters, and Geoffrey of Monmouth's Historia. Names from those sources carry genuine mythic weight that invented fantasy coinages don't. Ban is short enough to be ancient. Escanor is obscure enough to feel forgotten by everyone except the person who chose it. That combination — brief or archaic, carrying old weight — is the Sins' naming register.
