He was separated from his family when he was little, and others killed his sister Tag. He lives with Stella (an old elephant who passes away at the beginning of the book), Ruby (the baby elephant who replaces Stella once she becomes older), Bob (a dog) and Not-Tag, a stuffed gorilla that Bob sleeps with.
Also, the janitor, George, has a daughter, Julia. Julia likes to give Ivan crayons, paints, and paper so that he can draw. Ivan loves to draw and he figures out throughout the book how much he wants to be an artist. Ivan is very sweet. He was raised as a baby by Mack and his ex-girlfriend who walked away on him. Ivan was treated like any other little boy. Ice cream, baseball, things like that.
Once Mack's girlfriend walked out, Mack decided that Ivan was getting to big for his apartment, so Ivan moved to the mall that Mack owns.
It's a really interesting, sad, adventurous book that I really recommend you try. Bye guys!