PDXL

Please note you'll probably want "blunt bangs" for the version from the original series.

Outfits:
Default School Outfit: "brown vest, school uniform, plaid skirt"
Alt School Outfit: "serafuku, black serafuku, sleeveless, red necktie"
Edgy Roaming Around: "black cloak" + whatever you want under it
Adult: "large breasts, white shirt, black skirt"

Please share any cool gens! I might use them to help refine the model if they are good enough because I want to work on it more but she is lacking art.

SD 1.5 (+useful notes)

Eva from Mahou Sensei Negima and UQ Holder. Both forms are createable. The trigger words sections has both options. The "mahou sensei negima!" tag is useful to adjust the style closer to the original, but it isn't strictly necessary.

I would suggest putting "evangeline a.k. mcdowell \(adult\)" in the negatives if you want to gen the version from the first series.

This will gen the school outfit for her reasonably consistently "serafuku, black serafuku, sleeveless, red necktie"

Adult Eva had fewer images available so getting good gens of her is slightly more difficult.

As Usual:
Trained on Anything v3
Demos are Anything v4.5 with model weight 1.0
I would suggest using EasyNegative with a weight around 0.8