Sorry for the double post, but I just wanted to tell you that I found the file...:biggrin:
Using Tinke v0.9.0.0:
It is located in: a/0/3 Folder 1. The file is the number 1_10, it is compressed and contains various graphic elements, including the overworld "choose your name" sprite of Lyra, Ethan and Silver (Rival). The palette is found in the file 1_1.RLCN, which contains several palette inside: The fourth is for Ethan, the fifth is for Lyra, and the seventh for Silver.
I hope it will be helpful to others in the future...:smile: