@ MDA: The only embroidery stitch I know is satin, so I can't help you there, but I can give you a website to a lady who is like the embroidery goddess or something. :P
She usually has videos and step by step instructions on almost all her stitches.
As for your question about Kefka, I think the triangles could be done with a satin stitch. To be safe though, you might want to make a line that goes all the way up one triangle and embroider it in two separate pieces so the stitch isn't as wide. So basically embroidering two small triangles to make one big one. Make sense?