The Diary of Seymour Powers — Nancy Riecken

Mild-mannered cat by day, you'd never know what happens to Ginger at night. He turns into Jin-Ja-Bere, a real super hero who saves the world with every swish of his tail and batting of his eyes. Teamed up with young Seymour Powers, cat and boy find adventures in the oddest places. And of course, Seymour writes it all down in his diary.