In Archie's reboot, Nikki was a female lynx. She was a child protégé and the daughter of Dr. Ellidy, Nicole's creator. Some fans speculated that she was Dr. Eggman's corrupted AI "Phage" and I roll with that theory.
Images of Nikki are scarce, but we're working with what we have. She is still a gray lynx with black ends on her ears. Here she had yellow eyes and wears a scarf that matches them. The tooth gap emphasizes that she's still young; around Tails' age. Alongside the scarf is a white, sleeveless shirt with the blue flower still intact. She now wears a purple skirt and shoes with black shorts underneath.
Rather or not Nikki spent time as an AI, I would make her Nicole's little sister. Maybe even her administrator. Either way, Nikki would get along great as Tails would find he has a lot in common with her, just like with Sage.
Umm, actually... Dr. Ellidy established that Nicole was made using the scans he made of Nikki's mind before she died. He intended to fully upload her mind but only completed the initial scans. That's why Nicole took on a lynx for when she decided to manifest a body, it was already somewhere in her program. Though it could be possible Robotnik got a copy of that data and used it to create Phage.
Umm, actually... Dr. Ellidy established that Nicole was made using the scans he made of Nikki's mind
Sorry. I didn't understand the context here. I don't mean to be that guy but it just happens. Just ask my brothers. For my younger brother I accidentally gave away the twist in Metroid Fusion, spoiled the end of Cowboy Bebop, and and predicted the entire movie of Air Bud based on my own cynical understanding of the kid movie formula. They hated watching Star Trek Voyager with me because I could predicted most episodes by the first commercial break.
Sorry. I didn't understand the context here. I don't mean to be *that guy* but it just happens. J