By some weird reason, wizards and MadScientist types often have names ending on "ius" (possibly just "us", but "ius" is just better). It makes their names sound more smartass and in the same time BadAss.

TruthInTelevision with Vesalius and all of the other Medieval/Renaissance scientists who used Romanized names (Keys would become Caius, to cite a real-life example), the likely inspiration for the trope. It's frequently CanisLatinicus, though.

See also TheGreatWhodini.
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!!Examples:

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[[folder:Comic Books]]
* ''{{Spider-Man}}'': [[DoctorOctopus Dr. Otto Octavius]].
* Dr. Cornelius from ''ComicBook/{{X-Men}}''. (He's the ''other'' guy responsible for Logan becoming Wolverine.) [[note]]Most versions of the story depict a bald Asian guy and a red-haired or brown-haired, bearded guy working on the soon-to-be Wolvie. The bearded guy is Dr. Cornelius. The bald guy's the one who invented the adamantium bonding process, and ''Lady Deathstrike's father.'' He shows up more often and is more recognizable, in the comics and animated versions.[[/note]]
* [[{{Morbius}} Dr. Michael Morbius]], a ProfessorGuineaPig, became a Living Vampire.
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[[folder:Film]]
* There is a Dr. Vesalius in the Creator/VincentPrice movie ''Film/TheAbominableDrPhibes''.
* Dr. Pretorius the mad scientist from ''Film/BrideOfFrankenstein''.
* Dr. Morbius in ''ForbiddenPlanet''
* Dr. Cornelius and Dr. Zaius from ''PlanetOfTheApes''.
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[[folder:Literature]]
* Theatre/DoctorFaustus.
* Also Dr. Cornelius from ''TheChroniclesOfNarnia'', a magician though not an evil one.
* Dr Igneous Cutwell, from ''Discworld/{{Mort}}'' is another non-evil wizard, and is unusual in that it's his ''first'' name that fits the trope.
* The ''VesperHolly'' series has Dr. Desmond Helvetius
* ''Literature/HarryPotter'', of course. A lot of wizards have names ending in "us" : Albus, Lucius, Regulus, Remus, Rubeus, Severus, Scorpius, Sirius... It seems to be more frequent in the Pure-Blood families, though.
* Joseph Sheridan Le Fanu's OccultDetective Dr. Hesselius.
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[[folder:Live-Action TV]]
* Dr. Cornelius from ''Series/DoctorWho'' - a name which actually sounded somewhat jarring because of this very trope, given that he's an ordinary medical doctor.
* Dr. Gaius Baltar from ''Battlestar Galactica'' (both the [[Series/BattlestarGalacticaClassic classic]] and [[Series/BattlestarGalacticaReimagined reimagined]] versions).
* Gaius, the court physician from ''{{Series/Merlin}}''.
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[[folder:Music]]
* Professor Psychoticus, Mike Barson's alias when {{Madness}} were pretending to be The Dangermen.
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[[folder:Video Games]]
* Dr. Nefarious from ''RatchetAndClank''.
* Dr. Mordin Solus from ''VideoGame/MassEffect2''.
** Most named turians throughout the series, in fact, have it somewhere in their names. Garrus, Saren and Desolas Arterius, Nihlus, Councillor Sparatus, Primarch and Tarquin Victus, General Corinthus...
* Dr. Mobius and Dr. Borous from VideoGame/FalloutNewVegas. In their cases, however, the names also fulfill [[MeaningfulName another theme, along with the rest of that level's doctors]].
* Dr. Genarius from ''Frutti Freak 2''.
* [[MadScientist Avernus]], Danarius, Decimus, and Corypheus from the ''Franchise/DragonAge'' series, all of whom are [[EvilSorcerer evil sorcerers]]. Silly!Hawke even lampshades this, saying that someone with a name like Corypheus is bound to go [[EvilLaugh "mwahaha"]] at some point. Minor mage [=NPC=] Tobrius is, by contrast, a good man.
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[[folder:Webcomics]]
* [[http://www.webcomicsnation.com/eddurd/everydayheroes/series.php?view=single&ID=119374 Professor Odious]] from ''EverydayHeroes''.
* Subverted in ''LastRes0rt'' when Gabriel Damascus ends up being a Doctor... except his name is actually Gabriel ''[[NamesToRunAwayFromReallyFast the Maskless]]''.
** Other doctors in the comic include Qin Xu and Daisy Archanis.
* ''Webcomic/TheOrderOfTheStick'': Vaarsuvius, Aarindarius. And then subverted by Inkyrius, an apprentice baker.
** And of course Elan goes on to rename himself as Elanalicious.
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[[folder:Web Original]]
* ''Literature/TheDescendants'' has Doctor Paralus, which is his actual name but the heroes are constantly mocking it as Powerless or Perilous. A BadFuture is shown where he does in fact become Doctor Perilous.
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[[folder:Western Animation]]
* Professor Calamitus in ''JimmyNeutron''.
* Another Dr. Pretorius in ''{{Felidae}}''.
** His name is Preterius in the German original. Still fits this trope though.
* Yet another Dr. Pretorius in ''WesternAnimation/TheMask'' animated series.
* ''WesternAnimation/TheVentureBrothers'': Dr. Byron Orpheus.
* Dr. Anton Sevarius from ''WesternAnimation/{{Gargoyles}}''.
* Dr. Malignus, a minor recurring villain from ''[[TMNT2003 Teenage Mutant Ninja Turtles]]'' (2003).
* Dr Colossus, a throwaway gag from ''TheSimpsons''.
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[[folder:Real Life]]
* Dr. Viktor Capesius, Doctor of Pharmacy, physician and pharmacist in the Auschwitz death camp and right hand man to another MadScientist, Dr. Joseph Mengele.
[[/folder]]
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