It could be that they are in a pretend game or cosplay. Or perhaps they are working on a project where helmets are necessary.
The reason they are wearing helmets might be to protect themselves while exploring a new place or participating in a construction activity with each other.
Maybe he's protecting himself from something dangerous or it could just be part of his style.
Maybe he's wearing a helmet for protection or it's part of a funny costume.
Maybe he's protecting himself from something that makes him sad or wants to hide his emotions.
It could imply that the guy is into extreme sports or adventure.
The helmet on the cartoon dog might be for protection or just a fun accessory to add some style.
It could symbolize a combination of cuteness and strength. Maybe it shows a unique and adventurous personality.
I'm not really sure. It could be a symbol for something specific, but without more context it's hard to tell.
It could symbolize adventure or exploration in a fun and imaginative way.
I'm not sure. Maybe it's a fantasy or humorous cartoon where Bills decides to go without a helmet for some unique reason.
Maybe it's because it shows kids being safe and responsible. That's something parents and people in general like to see.