Shion is the gag character. Some others have similar traits, but she is the main one. Basically the shitty relative you don’t want around but have to otherwise they make a fuss. Yet they make a fuss no matter where they are so you simply have to handle them yourselves at all times. Deserves what she gets for not having -any- character development, ever.
But it’s manga and that character type is a normal trope forced into the stories to appease the fanbois and sell copies.
Gobuta actually has character growth and he strives to do better each time you see him. Not a useless annoying sack of “I’m good enough to do anything I want and go everywhere with the leader because otherwise I’ll whine like a baby if I don’t get my way.”