One of the WIP games, Freak: Amidst the Neon Lights by @Snoe introduces a deceptively simple yet clever height/build mechanic that affects the story as it unfolds.
For example, the “Big & Tall” MC has better odds of physically pushing/lifting their way out of the wreckage of a downed plane. Whereas an MC who is “Lithe or slight of build” is going to struggle attempting the same feat. The corresponding text also reveals why the MC can physically achieve the desired outcome or not.
I really like how Freak: Amidst the Neon Lights introduces and defines MC abilities and personality traits. Nicely done.