Why would you want to go any larger, just for the looks? I cannot see any performance enhancement what so ever.
A larger tire will slow down the turn in due to larger diameter of the tire and wider radius of the tread increasing the leverage to turn it in. It will also slightly raise the front increasing the rake and trail. It will make your bike feel sluggish.
If it's just for looks and you don't mind the handling slowing up and the bike feeling a bit more cumbersome you might be able to fit a 110/90 on there, but I have no idea if your fender will clear. You might have to slightly modify the fender mount holes or go to a different fender.
I did this very change on a MotoGuzzi I had. Made the bike handle like a truck. The first thing the guy who bought it did was to go back to the 100/90. I used that knowledge a few times in the future, but going the other way. I had a standard Gold Wing that I wanted to quicken the response so I went undersize on the front and rear tires by one size. The bike became much more responsive. I also did the trick with my current Zephyr, but only going down on the profile from 110/80 to 110/70 and getting much the same thing - much quicker steering, which was what I wanted.