Mattias is one of the many Schneien children. He is part of the set of octuplets including Tobias. He has narcolepsy, which has a constant impact on him. He always appears sleepy, and will often pass out at inopportune moments. Despite his own troubles, he looks out for Tobias, and supports him as much as he can. Sweet and even-tempered, Mattias is gentle and looks after others. He and Tobias seem to be closer to each other than some of their other siblings. Mattias cares about Tobias's being.