sakuga@wiki says the last two cuts are Amemiya's, not sure about the first one.

nice, I included the first one because I guessed it was also him. Ofc it's Imaishi's board first and foremost, but the angular drawing feels like something only amecchi would handle of those credited who aren't already tagged elsewhere. Other possibilities are Hirokazu Kojima and Shingo Abe. the rest most likely stuck to character acting