Spirit of the forest, looks like the John Goodman character in Monsters Inc, only more furry and laconic. Helps Setsuki and Mae when their mother is in the hospital (prob. a TB sanitorium). The movie is a slow-moving yet fascinating portrayal of rural Japanese life. A university professor moves with his two daughters to a new (but old) house near a forest. His daughters discover "dust bunnies" which leads them to find some funny little totoro (?) creatures. Not everyone can see the spirits of the forest, only the pure in heart. Mae is enchanted with them and determined to find the king of the forest. When she gets lost, older sister Setsuki runs everywhere searching for her, finally seeking Totoro's help.
Needs more about the Cat Bus, the enchanting music, the village -- and Totoro