The majority of Genex monsters tend to be Level 3 and have approximately 1500 ATK or lower, but this allows them to be easily searched out and summoned to the field from the deck. There are also a couple of cards that can fill in for "Genex Controller" by having their name be changed to "Genex Controller" once per turn, increasing the flexibility of the archetype.
"Genex" monsters were introduced in "Duel Terminal - Invasion of Worms!", with further support added in "Justice Strikes Back!!", "Champion of Chaos!!" (this support being in form of the Real Genex sub-Archetype) and "Charge of the Genex" (this support being in form of the Genex Ally sub-Archetype).
The four primary Genex Synchro monsters do not name a specific material monster, but each is intended to be summoned by tuning Genex Controller with a specific Genex monster; Genex Furnace for Thermal Genex, Genex Undine for Hydro Genex, Genex Gaia for Geo Genex and Genex Blastfan for Windmill Genex. In each of these cases, the Synchro monster appears to be a more advanced version of its associated material monster.
Genex monster names seem to be derived from several forms of energy development (Hydroelectric, Geothermal, Solar etc).
Genex monsters are also supported by 2 sub-Archetypes known as R-Genex and Genex Ally. While R-Genex focus heavily upon swarming to better enable Synchro Summoning, Genex Ally focus on aggressive tactics that depend upon manipulating various Attributes.