I didn't realize it until now, but his friend's character design -- bald/buzzcut, serious/happy eyebrows, sunglasses-- is absolutely hilarious when you look at it next to all the people in this manga with super shiny hair or next to all the flowers/plants that look like they took more effort than 10 of him combined.
I like his design, but it just makes me laugh in context. So out of place yet so in place. The perfect stealth gag character.