When a new kid moves into the empty apartment in Periwinkle Tower, Mimi is giddy with excitement. Could she finally be getting the BFF she has always wanted? In fact, she is not: what she gets instead is Boris, an awkward, quiet, dinosaur-loving, eating machine. The more time Mimi spends around Boris, the redder her mood ring gets (that's red for angry). The worst comes when he has to help her make the decorations for the Christmas pageant—and, of course, Boris wants to make a huge cardboard dinosaur with a sparkly body and gold tooth. As the year goes on, Mimi slowly begins to realize that Boris means well, and that it's better to be a friend than a bully. Lively spot art (where dinosaurs make frequent appearances) accompanies the short, readable chapters. This first installment of Mimi's adventurous antics offers a roller-coaster story filled with humour, good lessons, and new friendships. — Rosie Camargo

– Booklist Online, Nov 29, 2018