Reference sheet for some of Shion's alternate costumes:

a) Grumpy Mummy (Momia Gruñona), with colours (b1).

b) Diver in Black (Buceador de Negro), with back view (b1) and colours (b2). That's his swimsuit for you xD

c) Master's Replica (Réplica del Maestro), with back view (c1) and colours (c2). As you can see, he has a fonic 3 in his back, meaning that he was the third replica of Fon Master Ion.

d) Serpens (Serpentario), with back view (d1), colours (d2) and a detail of the symbol in his chest (d3). Reminiscent of Golden Snake but slightly more complicated, this outfit is Shion's final one.