The third legendary to be a shiny for X+Y is naturally Giratina. I did reveal him in his other form twice, so took the chance to draw his real one, even as a chibi.
I quite like this guy, he's going to get a big role in the series.
By chances he knows the cause behind Yveltal's deadly touch.

The fandom likes to face ghost types as some sort of reincarnation of dead mons but X+Y won't swim that way. Instead, they are just as living beings as anyone else but hold some spiritual connection with the dead, similarly to shamans and medium. That fact alone will be vital for the plot.