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.
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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
|
 Red
|
 Blue
|
 Green
|
 Black
|
| ⁑[name]⁑ Holy (ホーリー Hōrī) |
≡[name]≡ Blaze (ブレイズ Bureizu) |
§[name]§ Smart (スマート Sumāto) |
＃[name]＃ Wild (ワイルド Wairudo) |
†[name]† 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
|
White
|
WX-14 Succeed Selector |
| Nature Spirit: Space | White
|
Red
|
WX-15 Incited Selector |
| Living Spirit: Misfortune Insect | Black
|
Blue
|
WX-15 Incited Selector |
| Living Spirit: Dragon Beast | Red
|
Green
|
WX-12 Replied Selector |
| Image Spirit: Wisdom | Blue
|
Green
|
WX-15 Incited Selector |
| Machine Spirit: Electric Machine | Blue
|
Black
|
WX-12 Replied Selector Promo card Code Art †ALCA† |
| Image Spirit: Angel | White
|
Black
|
WX-14 Succeed Selector Promo card †Ayase Kamiyugi†, Angel Killer |
| War Spirit: Playground Equipment | Green
|
Black Blue
|
WX-15 Incited Selector §Takara Tomy Taso§, 3-Play |