His design for old Noctis is easily my favourite for a FF main character, Luna's design is also one of my favourites. He also worked on the redesigns of the main four after the director change in FFXV. The wiki has some good insight on what he changed in their designs. His redesign for Promoto made him look much more relate-able. What I like about his designs is that they are more down to earth than Nomura's designs, while still feeling like Final Fantasy characters. Even if I didn't like him that much, Caius's design blends elements from Amano and Nomura quite well. Another thing is that his designs fit HD graphics and appeal to western tastes much more than Nomura. Which is where the future of the series at. He did the design for Agni's Philosophy and I want FFXVI be something similar to that. The world design for Agni's Philosophy is also a great blend of what you expect from FF and realism.