Alolan Muk is very colorful. I definitely wasn't expecting that kind of design, but I like it. It looks like it's been painted.
Considering Tsareena's kick move, I wonder if it's sort of like a physical Lilligant.
Ribombee's scarf is adorable. I might use the final evolution on my team.
Olivia is hot. If the island kahunas have type specialties like the trial captains, that would make Hala Fighting, since he was shown using Crabrawler in a trailer. If the kahunas are also the E4 equivalents, that would make Olivia the first E4-class trainer to use Rock types, as every Rock specialist before has been a Gym Leader.
Also I thought Ilima was female before, but seeing them in full they look androgynous. (I'm not sure if GF would make a non-binary character, but I'm using "them" because I honestly can't tell whether Ilima is male or female)