New Spirit Italics have been a challenging design for Riccardo and I.
Since New Spirit is not a text face, the italics have been design to both harmonise with the Roman in the typical way, but also to stand up as a display on their own.
It's a very lively design, and we've tried to calm it wherever possible. I still feel that there are improvements to be made, but I've become too close and so I'm posting here for your wonderfully fresh eyes.

Comments
Maybe the backwards curve on f is too much, and have you considered a curve on the bottom as well?
The o bothers me a little, always hard to get right on italics. Maybe it could be more like the caslon italic o (i.e. move the tension around in a kind of non-calligraphic way, if you see what I mean)? Currently it works with n but not with b imo, so you could also consider changing bdpq.
Feel like the foot of k is pointing up too much.
Have you tried ball terminals on the s?
I would make the comma a bit taller and the dieresis a bit wider, but I might be thinking too much in terms of a text face.
Maybe a slight curve on the diagonal of y could soften it up?
I'm not convinced by z. Maybe keep the top straight and give the bottom more curve?
Have you considered removing the serif on the middle of w?
The diagonal of e could maybe be more diagonal?
Is r too wide?
Keep us posted!
/N could be a little wider.
I really like it overall.
My only suggestion will be to add a little bit of mass to the small uppercase serifs to compensate for the big spur that ends the letters, for example in the /L
I shall take all of your suggestions on and share the next update.
Great to see you posting!
redrawn right legs of /n/m/h
Lower serifs removed from /f/h/k/m/n/r/p/w.
middle serif removed from /w
ball terminated /s
the /z still needs work.