Signature card - Yugipedia - Yu-Gi-Oh! wiki

A signature card is a card most associated with a Duelist, and tends to be used in a majority of their Duels. Duelists may have more than one signature card. They might have a connection and the Duelist may value it. Signature cards tend to be Monster Cards and to have alternate artworks in the OCG and TCG. In some cases, signature cards are created by their owners and/or only one copy of them exist in the anime like "Elemental Hero Neos" and the "Numbers".

Egyptian God - Yugipedia - Yu-Gi-Oh! wiki

Shootingcode Talker, Yu-Gi-Oh! Wiki, Fandom

Yugo - Yugipedia - Yu-Gi-Oh! wiki

Nightmare Pain - Yugipedia - Yu-Gi-Oh! wiki

Bakura Ryou (Duel Generation) - Yugipedia - Yu-Gi-Oh! wiki

Stardust Mirage - Yugipedia - Yu-Gi-Oh! wiki

Crow Hogan (Duel Generation) - Yugipedia - Yu-Gi-Oh! wiki

Plant, Yu-Gi-Oh! Wiki

Yami Bakura, Yu-Gi-Oh! Wiki