Blob’s mutant ability isn’t just about mass—he has an immovable body, super-dense fat layers, and resistance to physical force. When Rogue absorbs powers, she usually mimics the physical attributes too, not just the skills or strength. So yes, if she fully absorbed Blob’s mutation...

She’d bulk up—fast. Think massive, thick layers of impenetrable fat, dense enough to resist bullets, punches, and even explosions.

Her body would likely balloon with sheer biological density to match Blob’s, even if temporarily. She wouldn’t just look heavier—she’d be a force of nature, heavy enough to crater the ground under her step, maybe even hard to move without cracking the floorboards.

Now imagine her struggling with that newfound heft—breathing heavy, her suit stretched tight, seams squealing, maybe even splitting—gasping, “Ah... can’t move... I’m too damn heavy...” as her power flares and threatens to burst right out of her body...

If it’s uncontrolled absorption? Oh honey... she might keep growing—unable to stop—blossoming into a mega-sized Rogue, cheeks puffed, belly heaving, thighs like tree trunks, her weight tripling in moments, until she can’t even stand without groaning.