Fantasy is a common theme. His stories usually take place in fictional worlds, whether it's a parallel world like in 'Death March to the Parallel World Rhapsody'.
I'm not entirely sure about all of his works, but some of his light novels might have elements of adventure and fantasy. They often involve a protagonist who has to overcome difficulties in a different world or situation, like in many light novels of this genre.
Well, usually, the kid shows a lot of excitement and joy. The dog might be playing fetch or just wagging its tail and having fun with the kid. Sometimes, they might be in a beautiful park or a backyard.
It could be a comic that offers a protected or safe environment for the characters or story. Maybe it's set in a secluded place or has a theme of security.