I added a Chaos Emerald in his hand to add a bit of familiarity. He doesn't actually use them in this game, but Sonic does in his campaign. Since both campaigns are part of Sonic X Shadow Generations, I felt I should represent Sonic's story in some way. It's not a huge representation, as the ad is clearly Shadow-centric, but I think it ties things together nicely. Plus, Shadow has historically had possession of the yellow gem. Additionally, most of the marketing for this game has been centred on Shadow's campaign, since Sonic's is just a remaster, so it felt more topical to go this route.