This is a muscle growth series focusing on characters from the entire universe of Sonic the Hedgehog, including the less known ones. This is also requested by  backyardgameboy

NOTE: BackyardGameboy did not exactly request Barby and Wallaby before, but I thought it could be better once we take a look at these two affected by the glowing stone. Some of the story are also taken from Bill's as they are at exactly the moment when these characters meet each other.

Both Barby Koala and Walt Wallaby of the Downunda Freedom Fighters had received the news from their friend regarding the recent events happening in New Mobotropolis, so they sent Wombat Stu and Guru Emu to deal with that matter, as the former two planned to learn more from their friend in private. Their friend in question was Duck "Bill" Platypus, both their fellow and the leader of the Dark Egg Legion chapter stationed in Downunda. Walt and Barby stopped by and waited in the sewers underneath the base of Downunda Dark Egg Legion, until Bill arrived. However to the former two, the upcoming shadow of Bill looked way too different, he wasn't supposed to be big and tall, and so they immediately armed themselves against the supposed imposter, but the said shadow never lied at all, Bill had ended up big and muscular. What was worse added to Walt and Barby's horror was Bill's genuinely evil smile, as the two were ambushed by the newly transformed Legion platypus soldiers, who were too strong to be beat. Walt and Barby fully trusted in Bill, who had been forced to join forces with Eggman against his own will, and this situation had become too real to deny their platypus friend's serious betrayal. However, Bill still saw Walt and Barby as good friends, he just couldn't kill them or turn them in to Eggman. Instead, he unveiled the violet stone, so as to transform the two into his new, equally big and muscular comrades. Walt and Barby were understandably livid, but with these new changes unfolded, they began to feel some mad desires, to the point of admiring their friend-turned-master.

As everyone inside the bunker were recovering, Bill's minions then removed their hoods, revealing marks on various spots, indicating their cybernetics were removed from the inside. Bill revealed that he had transformed all of his Legion into a muscular army that could take control over Downunda. Bill declared his defiance against Eggman and had initiated his new plans into motion: turning every Downunda citizen, whether platypus or not, into a military bodybuilder bent on assisting conquest. Bill then laughed evil, followed by his minions, and then the newly changed Walt and Barby.

It didn’t take long for both Barby and Walt to feel that they and Bill, as bodybuilders, had a strong need to dominate. And who better to begin with than their old enemy, who Bill himself had a personal vendetta against. Bill chuckled enjoying Walt’s suggestion, taking the stone back twirling it in his hands. Walt and Barby turned heading back to the Downunda freedom fighter base to meet wait for Wombat Stu and Guru Emu. Then prepare for the next step of Bill’s grand plan. Whereas Bill used his army’s computer to track down a certain robot’s ID number. Bill sneered clutching the violet stone as the computer locked onto their target; Crocbot.

Mobian Muscle Growth:
ALL || CYAN || PURPLE || RED