Note: All taken in Gmod. Requested by  Draco-rex.

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All was quiet in the area of the derelict factory compound, and it was just the right kind of quiet for a blue-shelled hammer bro to rest and try to catch some sleep. Said kind of koopa was a rather large one, both in size and bulk, his shell having distended a bit during the time he had it to try and fit what gut there was within. He was also a good deal lazy, since if he wasn't on duty, he was most likely kicked back and asleep in one spot that he found suitable for a nap or two.

Doesn't really mean that something or someone won't find and disturb him.

The hammer bro was able to hear the sound of heavy footfalls, his eyes slowly opening to try and see what it was that he was hearing. A small groan came out from him as low-and-behold, it was his 'boss' Bowser approaching, and not looking too happy based on the glare that he was on the receiving end of. Before the hammer bro could even open his mouth to ask what was going on, he found himself being verbally scalded by the koopa king, hearing stuff along the lines of him 'not being menacing enough' and 'sledge bros doing a better job'. One part that annoyed him the most was Bowser mocking on how 'fat and lazy' the hammer bro was, whom let out a small puff of annoyance through the nostrils before moving his right arm into his shell, rummaging around for the hammer he had.

If a couple things were certain with him, he did not like being bossed around, nor did he liked his bulk being made fun of.

Grabbing hold of the hammer he now found, the hammer bro brought it out and held it over his head, which cut the koopa king off from his rant. Before a question could sound out, the hammer landed smack on top of Bowser's head, easily earning a grunt out from the hit. The damage it did though was minuscule compared to what properties the hammer itself had, the koopa king starting to dwindle down as the hammer was kept pressed to the top of him. The size he lost wasn't gone though, instead transferring to both the hammer and the hammer bro wielding it, growing the same amount that the now-smaller koopa was shrinking.

"Sorry, boss," The hammer bro started as he was now working on getting up from his spot, tilting forward the larger he got and the smaller Bowser went "but I don't really appreciate it when others try to boss me all over the place. I also don't like it when they decide to throw insults at my chub." he explained as he kept the hammer down on the micro-goomba-sized koopa now. "When they do, they find themselves on a lengthy trip to Tiny-ville."

Smaller and smaller the koopa king went as the hammer and its owner equally grew, the hammer bro soon unable to see the tiny koopa. A few seconds longer and the hammer was able to touch the ground, which was then lifted up from its spot as the hammer bro stood up in his spot. Down on the ground and in a crater that was made from the hammer when it pressed down onto it during its growth was the bug-sized Bowser. The process had made him black out as shown by his body not moving, the hammer bro reaching down and pinched a couple of fingers on the spiked tail he had, carefully lifting the tiny koopa up from the small dip he was in. The grip was so that the unconscious koopa wouldn't slip as he was soon held up next to the hammer bro's head, the eye closest looking over and gazed on the minuscule form that the one who bossed him around now had, shifting him after a moment and closed his hand around him. He would return Bowser to his normal size later on, but for now would simply enjoy being the true giant for once.

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The last pic is simply a bit of a bonus one that the requester wanted me to put in. To say the least, the Shrink Bro - whom I've kind of yet to think of a name for him - is one that's admired by other hammer bros given his ability to rob the size of those he hits with his hammer, but only on top of the head. Otherwise, the effect won't trigger and it'll be like getting hit by a normal hammer. Throwing it won't trigger the effect as well, so he has to hold onto it at all times if he wants to steal someones size.

Ragdolls/models used for the creation of him; Sledge Bro x1(all but the legs deflated out of view(wish the advanced inflator was back in the workshop. I'm aware that it's still in the files of offline mode, but still...)), Boomerang Bro x1(legs deflated out of view, torso up to 1.25 for the X and Y axis, but left normal for the Z axis, overall size scaled up to five to fit Sledge Bro legs), Sledge Bro hammer(scaled up to one and a half times its overall size for his normal size).

Bowser, Hammer Bro, Boomerang Bro © Nintendo.
Garry's Mod © Facepunch Studios/Garry Newman, Valve.