With the size of its half frame, your shots will look even more analogue than before!
Why shoot a 1600 ISO film and push-process it when with Diana Mini and 100 ISO you already can see the picture resembled from those strange dots called grain? It’s no secret that grain is always apparent especially in films with high ISO, no matter what the frame size is. So that, if you are taking half-frame sized photo, the grain will be much more noticeable then on 6×6 frames!
Shoot some bright contrast scenes with some film you gonna cross-process (a bit better then negative) and observe the double-sized grain in the same picture size as before (half-frame perfectly does the job).
Just one more tip: the sharper/ more contrast contrast the scan is, the more noticeable the grain will be :)