Each of them will advise on all the complaints you ask. But each character has its own specialization and varies every character.
Gintoki will answer all your questions regarding work, love life and also the future. Shinpachi is a bit weird. The glasses will answer your questions about Idol, as well as complex issues (can be in a strange sense, as well as embarrassing). While Kagura answers questions and suggestions about friendship.
Judging from the pictures on his website, the possibility of other characters will follow.
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