"Dark Magician" monsters have several features in common:
The armor of most "Dark Magician" monsters is a collection of shiny, curved plates with sharp edges, all of the same color, which covers the torso and shoulder areas. On the edges of the plates are curved trimmings of contrasting shade. "Magician's Robe" is the monster version of it.
Some of these monsters also have hats which appear to be similar to a stereotypical wizard's hat, which is usually crooked, leaning forward at the tip and with several rings which segment it. These rings are of the same color of the curved trimmings seen elsewhere on its attire.
Some of these monsters have Spell Counters embedded in their staff, shield, sword or armor.
The inclusion of "Dark Magician Girl" cards seems to be implicit, as their names don't contain "Mago Nero".
Naming in the TCG
In French and German, the effect of "The Eye of Timaeus" supports both the "Dark Magician" archetype ("Magicien Sombre" and "Dunkler Magier", respectively) and the "Dark Magician Girl" archetype ("Magicienne des Ténèbres" and "Dunkles Magier", respectively), due to the gendered nature of the language causing the term "Dark Magician" to differ between "Dark Magician" and "Dark Magician Girl".
In Portuguese and Spanish, the effect of "The Eye of Timaeus" supports "Mago(a) Negro(a)" and "Mago/a Oscuro/a", respectively, which includes both the name of "Dark Magician" ("Mago Negro", "Mago Oscuro") and part of the name of "Dark Magician Girl" ("Pequena Maga Negra", "Chica Maga Oscura") in that language.
In Italian, despite the term for "Dark Magician" differing between "Dark Magician" ("Mago Nero") and "Dark Magician Girl" ("Ragazza Maga Nera"), only the former is ostensibly supported. This is the case for most archetypes in the Italian version, in other words, grammatical gender and number are implicitly acknowledged in terms of gameplay support.
"Illusion Magic" can reset the "Magician Navigation" combo mentioned. "Magical Dimension" can safely remove the weaker "Magician" and "Magician Girl" monsters from the field and replace them with stronger monsters. "Dark Magic Veil" can also be used similar effect without needing the "Magician Girl" engine mentioned above.
"Berry Magician Girl" can Special Summon a "Magician Girl" monster from the Deck when attacked. Good targets are "Chocolate Magician Girl", which can Special Summon a Spellcaster-Type monster from the Graveyard, and "Lemon Magician Girl", which can Special Summon a Spellcaster-Type monster from the hand.
This archetype pairs well with the "Pendulum Magician" archetype. This will bring high Level Pendulum Summons and, with it, faster Xyz Summoning and monster swarm, in addition to more Normal Spellcaster-Type monsters to use with "Ebon Illusion Magician".