Villainous example in Chapter 11; After licking their wounds for well over a hundred pages, Vice and K return with a vengeance replete with giant toppling blades and badass motorcycles.
Villainous example again in Chapter 12 with the rest of the evil doji: it's both pure horror and can get you bone-chillingly excited for the battles to come.
Mizho and Palace (especially Mizho) get one in Chapter 24 when they show a trio of street punks who they're messing with.
Dunstan transforming into his ICON mode in chapter 25.
The last third of Chapter 32 and the first half of Chapter 33 are simply dedicated to the awesomeness of Sayama. In her first battle, she enters Celty style in a leather suit and a motor bike, transforms with Regula, and beats a transformed Akira and Orgullo to the dust.