Trying to Find a Book

Not sure if anyone will see this, but I’ve been looking for this fiction book I used to read as a kid. I can’t remember what the title or the author was or even if it was a standalone novel or a series. I hardly remember the plot, I only remember a few random details: There was a character named Olivia who changed the colour of her hair a lot and tried to peel an apple in one go without breaking the peel and there was another character called Gabriel who had pet gerbils, and there was something about a pet cafe. Also I think it was a combination of the modern world setting and a medieval ‘kingdoms’ type setting. There was magic in it too, I remember one of the characters was a shape-shifter. As you can see it’s very hard to find the book when those are the only details I can remember, especially since those aren’t even part of the key plot 😂 

If you have ever read a book like this, please let me know in the comments, thank you, that is all.