Tilly is a best orca whale friend of Wendy Wong. She is the friendliest orca whale who accidentally killed all of Wendy's older siblings trying to befriend them and their accidental deaths shocked her and Wendy. She is also a friend of Harry D. Rabbit's, Harry's dog Spot's, Amy Fourpaws, Amy's grandma Ellen, Earl Earwax, Earl's older brother Joey, Wendy's zookeeper dad Thom and Stinky Jones.

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