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S1 Insignia

S1 Insignia

The S1 is a type of robot. The "S" stands for Seraph, and the "1" is the original prototype of the Seraph. In comparison, Robot's original body built in Chapter 1 was an S13, an evolved (or devolved?) form of the S1.

The S1 and all the other robots in Kat's laboratory were built by a man named Diego in honor of Jeanne, the ghost of Annan Waters.

We find out on Chapter 23, Page 14 that S1 was meant as a representation of Diego himself.