Watched that anime, was quite interested and fascinated with ODM gear. Reasons why nothing like that can't and won't ever exist in real life: Grappling hooks. There is no way to penetrate anything concrete-like with a shot projectile and have a reliable grip to sustain a human weight.

Dec 7, 2019 · Looking up ODM pilots and their lack of basic protection, it seems like everyone is OK with them dying but blacking out is not OK. This problem became much easier but disturbing. Simply adjust each cable's strength so it can only support the weight of the cable and person swinging at a particular acceleration.

Feb 19, 2018 · Just like the AOT walls, this isn't a possibility. Remember that that wall took 8 thousand years to build, is only possible in that climate with the extreme cold and they're barely able to manage it against the more mundane attackers.