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