Hmm pretty difficult stuff especially with just a few sentences and not the whole story. Lots of products like food and stuff are branded with cartoon characters in Japan. In fact the majority of food aimed at kids probably uses some anime character as a hook.
ザザエさん: This is a manga/anime. The anime is better than the manga. It's about a family where a young man has married the eldest daughter (Sazae san) of a family where the kids are quite separated in age, and gone to live with them. It teaches about Japanese culture and customs that are disappearing.
しんちゃん: This may be talking about "Crayon Shinchan". This is a manga/anime. The manga is better than the anime. It's about a family of a salaryman, a housewife, and a kindergarten kid (and his dog and friends, sister, etc.). The kid is "Shin chan" - he's really crazy and causes lots of problems. It's very funny. ゼロヨン is 04, maybe referring to the year. ーロチーズ is some kind of cheese maybe but it is missing a character at least.
タコちゃんウィンナー: This is probably a wiener sausage. Takochan may be another anime character.
ちびまる子ちゃん: This is a manga/anime. The manga is OK, I haven't watched the anime really. It's autobiographical stories about a woman's life, mostly about when she is at elementary school. It mostly concerns the daily life of an extended family. She has a liking for "essay style" stories that have some kind of point to make about life.
当り前の事を、当り前に言うのが難しいんだ。: I'm not sure exactly!! I think it is "even though something is obvious doesn't mean you can just point it out all the time". Of course this loses the play on words. I think "atarimae ni iu" means "to say something in regular/simple terms".