Teslarc, Knight of Solace

And here is Itsu's Duel Monsters Spirit/Alternate Self! Teslarc, the Knight of Solace!
Teslarc is everything Itsu is not. While Itsu is happy, mischievous, and fun to be around, Teslarc is dark, bitter, and and a lone wolf. Itsu always has a strong moral compass. Teslarc prefers to screw the rules and do things her own way, not caring about authority. Itsu holds back unless she absolutely has to. Teslarc charges at her foes head on with her vorpal blade.
Itsu supposedly created Teslarc out of the part of herself that feels connections. With Itsu hopping from reality to reality, she will encounter alternate versions of her parents, and occasionally, have to fight them. However, if they get injured or perish, Itsu will still be distraught, even though they aren't HER Yusei Fudo and Akiza Izinski, just a Yusei Fudo and Akiza Izinski. After a traumatic event that she refuses to talk about, Itsu finally had enough and split off part of her soul, Horcrux-style. This portion infused itself into a card and became Teslarc.
The interesting thing is that Teslarc, underneath her helmet, looks and sounds exactly like Itsu, except with long flowing hair, several scars on her face and more across her body, and a harsher, edgier tone to her voice. Itsu even uses Teslarc as a double every now and then, and since Teslarc is bound to Itsu, she cannot disobey an order from Itsu, which had led to the Duel Monster hating her original self passionately. But Teslarc suffers even more since she carries the burden of feeling the bonds of family and friends, even across dimensions. Yet Teslarc cannot bring herself to destroy her creator, because not only would Teslarc cease to exist the moment Itsu does, but Teslarc loves Itsu as well, even though there are so many reasons to hate her.
In some respects, Teslarc is more human than Itsu is...

Artwork by .
Teslarc is mine.