Stargirl (Patreon)

Some members of the Justice League have been noticing that Stargirl has, over the years, been getting more and more muscular. It would seem that the Cosmic Conversion Belt has had an interesting unintended interaction with the Cosmic Staff that has caused a sort of feedback loop that has channeled a growing amount of cosmic energy into Stargirl's body. This has made her more powerful in various ways, even when no wielding the staff or wearing the belt, but has also caused her body to become more muscular. The expansion of her muscle mass started almost imperceptibly, but seems to be accelerating exponentially. It took her almost four years to become this muscular, but half of that growth was just in the last couple months.