Sōsuke (そうすけ , Sōsuke) is the five-year old protagonist of the film, Ponyo.
Sōsuke is a 5-year-old boy who wears a sunshine yellow t-shirt and chocolate brown shorts. His hair is walnut brown with his hair shaven underneath. Also, he wears a sailor hat and binoculars.
Sōsuke is intelligent, smart, loyal, cute and heroic. He is willing to protect his friends (including Ponyo, starting from when she washes up on the shore near the house, stuck in a glass jar), even if doing so gets him in trouble with his mother or Ponyo's father (whom they hate).
He is interested in the sea, especially since his father is the captain of a ship. He also knows that Kōichi does his best for the family, as seen when Lisa gets angry at Kōichi and chides him for abandoning her family on a cliff.
Sōsuke is first seen when Lisa calls Sōsuke to come back home and he discovers Ponyo.
"Don't worry, Ponyo. No matter what, I will protect you. I promise."
- —Sōsuke promises that he will protect Ponyo.
- The "U" in his name is not pronounced.
- He appears similar to Kanta from My Neighbor Totoro when he wears a sailor hat.
|Main Cast||Ponyo | Sōsuke|
|Ponyo's Family||Fujimoto | Granmamare | Ponyo's Sisters|
|Sōsuke's Family||Lisa | Kōichi|
|Retirement Home||Toki | Yoshie | Kayo|
|Others||Karen | Kumiko | Junior | Junior's Parents | Bridge Guard | Newscaster | Sea Monster|
|Locations||Sōsuke's House | Himawari Nursery School | Koganei Maru | Underwater Harbor|
|Objects||Green Bucket | Jellyfish | Sōsuke's Boat|
|Music||Soundtrack | Gake no Ue no Ponyo|