Class (クラス Kurasu) is a property of SIGNI. Classes do not have inherent rules or abilities, but many card abilities only affect SIGNI with a certain class. A SIGNI class tends to generalize the theme of SIGNI belonging in that class.

A SIGNI's class appears at the bottom right corner of its card art, to the top right of its actual card text.

The names of classes are separated into two parts like a taxonomic rank; often a general type of "Spirit", followed by the more specific "race." Because of the broad, color-crossing nature of referring to SIGNI classes by their Spirits, SIGNI classes generally refer to the more specific races of SIGNI that are generally unique to a single color.

SIGNI Classes
Type White White Red Red Blue Blue Green Green Black Black Colorless Colorless
Image Spirit Angel Valor Wisdom Beautiful Technique Devil
Living Spirit Apparition Dragon Beast Water Beast Earth Beast
Sky Beast
Misfortune Insect
Machine Spirit Labyrinth Riding Machine Electric Machine Cooking Ancient Weapon
Nature Spirit Space Gem
Atom Plant Bacteria
War Spirit Arm Weapon Trick Playground Equipment Poison Fang
Origin Spirit Origin Spirit

Occasionally, SIGNI will appear in a color that is not the typical one for their class. In these cases, they are marked with special symbols around their name, and their kana reading has a word added to it.

White White Red Red Blue Blue Green Green Black Black
Holy (ホーリー Hōrī)
Blaze (ブレイズ Bureizu)
Smart (スマート Sumāto)
Wild (ワイルド Wairudo)
Fallen (フォールン Fōrun)

Currently, the cases of SIGNI not appearing in their typical color are:

Class Original Color Shifted Color Debut
Image Spirit: Beautiful Technique Green Green White White WX-14 Succeed Selector
Nature Spirit: Space White White Red Red WX-15 Incited Selector
Living Spirit: Misfortune Insect Black Black Blue Blue WX-15 Incited Selector
Living Spirit: Dragon Beast Red Red Green Green WX-12 Replied Selector
Image Spirit: Wisdom Blue Blue Green Green WX-15 Incited Selector
Machine Spirit: Electric Machine Blue Blue Black Black WX-12 Replied Selector
Promo card Code Art †ALCA†
Image Spirit: Angel White White Black Black WX-14 Succeed Selector
Promo card †Ayase Kamiyugi†, Angel Killer
War Spirit: Playground Equipment Green Green Black Black
Blue Blue
WX-15 Incited Selector
§Takara Tomy Taso§, 3-Play

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