Seeing a lack of Sage in the upcoming X-men 97 cartoon is bothering me. If you had the ability to bring her into the show, or otherwise introduce Sage to the masses, how would you handle her story?
That's a good question. I'd include her as part of a season long arc about the X-Men taking on the Hellfire Club, with her first appearing as a background member but becoming more prominent each time she appears. Her actions are always at least a little bit to the benefit of the X-Men, but ambiguous enough that it doesn't immediately read as a betrayal to general audiences. It should leave the viewers who aren't already familiar with her guessing about her true intentions. At the end of the story arc she goes against Charles' orders to maintain her cover at any cost and turns against the Club to save one of the X-Men from them. We'd see an overview of her backstory, followed by her being captured by Sebastian Shaw in the aftermath of her heel turn and the X-Men organize a rescue mission for her. From there she, along with a few other X-Men, would become disillusioned with Charles Xavier and she'd join the main cast in a loose adaptation of the early days of X-Treme X-Men where she is trying to find her place as part of a team of heroes. She'd be a bit of an odd one out at first, with her teammates not quite knowing what to think of her, but she'd show herself to be one of the most caring and dedicated members of the team behind her cold exterior. I'd love to give her some conflict with the O5 X-Men stemming from Charles choosing them and not her to be on the original X-Men team, and of course she'd be given an arc about trying to redeem someone that the rest of the X-Men gave up on.
Basically I'd try to capture the mystery and intrigue she had before it was revealed she was a mole in the Hellfire Club, but much more intentionally and clearly than the few moments she had in pre-2000 comics, in order to get audiences curious and invested in her as a side character. Once that had been established she'd be showcased as part of a main cast.
Sorry about the long answer, but it was fun to think about.

















