Otto is a distant relation of Theseus, the Surprised Bunny Monster, only Otto is far less surprised. Unlike Theseus, Otto enjoys Easter Egg hunts and has been known to foster baby chicks on occasion.
Hank is an Alien Monster, as should be obvious from the rather prominent single antenna on his head. Aluminum foil helmets may be worn in his presence to avoid having him read your thoughts.
Like his sister Clytemnestra, Ramon is a Kat Monster, though he objects to the diminutive term "Kitty." Unbeknownst to Cly (as he calls her), he often tries surreptitiously to return the various small items she steals.
What can I say about Henrietta the TriClops? She loves to play Old Maid, but often loses because she starts giggling uncontrollably as soon as she gets the Old Maid.
Likely related to Clytemnestra and Ramon (above), Matilda is really good at Scrabble, Lawn Jarts, and making one mean cup of tea.