A girl in her late teens who moves in with her dad in an isolated house in a forest after her mother passes away. After she blows up at him for his dedication to his work, she unwittingly gets caught up in the unending war between the forest's forces of growth and forces of decay.
Gadgeteer Genius: Has built gadgets that allow him to adjust to the "speed" of miniature creatures, allowing him to communicate with them.
Heroic BSOD: Seeing MK Leafman-sized is the breaking point for him, where he realizes he must have hallucinated and how far detached from society he is. He turns off his cameras and packs up or outright throws his equipment off tables in a rage.
The current Queen of the Forest, a Mother Nature-like figure who oversees the balance between growth and rot. At the onset of the movie, she is due to choose an pod which will bloom into her successor.
Big Good: The rulers of the forest are this in general.
Cloud Cuckoolander: Comes across this way in her introductory scene, though it's possibly unintentional. She accuses Ronin of being too serious, but she just comes across as not taking the Boggan threat seriously.
The Chooser of The One: It's the Queen's duty to pick her successor. Later, she picks MK to carry the pod to Nim Galuu.
Crazy-Prepared: Queen Tara tells MK how to restore herself to normal size before she's even been shrunk, knowing that MK would follow her subsequent instruction to find Nim Galuu, and from him procure a record of that memory from the Queen's perspective so as to get the message.
The High Queen: Allows the Boggans to come after her instead of letting them near her people.
I'm Dying, Please Take My MacGuffin: Is killed by a Boggan arrow while running from them carrying the pod which will bloom into her successor. MK finds her, and Tara bids her to take the pod to Nim Galuu before dying.
Voiced by: Aziz Anzari (Mub) and Chris O'Dowd (Grub)
A slug (Mub) and snail (Grub) responsible for overseeing the pods' care.
Ascended Fanboy: Grub spends the whole movie wanting to become a Leafman, but obviously can't because he's a snail. Ronin lets him at the end.
British Stuffiness: Played with. Some American viewers think that Grub has an English accent but although his character fits this trope (stuffy, uptight and snarky), he actually has an Irish accent, like his voice actor.
Know-Nothing Know-It-All: Nim is only as powerful as the scrolls that write the forests' activities, which cannot predict the future, and can only record so much. In the climax, MK calls him out on how he's relatively useless on his own.