Each member of this archetype is based on a mythological, ghostly female creature, but with cybernetic features unlike traditional spellcaster monsters. All of the monsters shown so far has a feminine appearance. The "Altergeist" monsters also sport a head piece that project laterally from their heads and lacks facial features except a smiling mouth.
The name "Altergeist" is portmanteau of the word Alter and poltergeist. All members of the archetype are themed after a Mythological Character followed by a Computing terminology.
The Main Deck monsters have slight disruptive capabilities, negating an opposing card's effects, stopping an attack, returning an opposing card to the hand or sending them to the Graveyard. Also, they have swarming capabilities that can be used to set up the Link Summon of their ace monsters, namely "Altergeist Primebanshee" and "Hextia", whose effects further reaffirms their swarming and disruptive abilities. Some of them also have an effect that triggers when they are used as Link Materials, searching for resources or retrieving cards from the Graveyard. So far, they are supported by Trap Cards that either revive them, protect them from attacks or even negate and destroy opposing cards.