Matti Tohn (マティ)
Age: 21 Shiro's best friend and a bike enthusiast. At the beginning he is just as cynical about the whole "space program". He is smug, but always on the lookout for his friend. (Sources: animeenglishdubreviews.blogspot.com, Japanese Wikipedia)
Voice Actors
Ricky Coello
Spanish
Kazuyuki Sogabe
Japanese
William Coryn
French
Bryan Cranston
English
Marco Balzarotti
Italian