Riko: hey mum, remember when you "sacrificed" me and left me in orth to go pursue your own ambitions?
Lyza: uh, yea? Why do you say
Riko:
Chuckles
Eren is an interesting choice, I'm sure titan shifters are effected by things like the abyss curse the same way as humans, and ODM gear can get any of the scouts/soldiers down the abyss quickly they are trained to cut napes with heavy swords basically in mid air so I think even many AoT soldiers will make it past layer 3
Besides, eren can harden his whole titan as of 3B, he could just do that and drop through layer 3, the interesting thing I want to know is the effect on titan transformations, does standing up in a 15m titan hit you with the curse? Does the titan get hit with it?
Apart from that, titan shifters can get past layer 4 because orby doesn't like things bigger than him!
Layer 5 is the tricky one, it depends on who the shifter is and whether we're placing bondrewd as a threat, layer 5 is basically a big ocean with constantly collapsing terrain, not good for big titans, bondrewd would have plenty of relics to take care of sluggish titans that can barely move in the 5th layer.
Eren often uses his titan for many strategies, he won't get past layer 5, but the beast titan is a 4D chess player, everyone seems to be in the right place at the right time, if he jumps out of his titan at layer 5, he might be able to slip past bondrewd.
My next one would be yellow diamond from land of the lustrous
curse - wise they'd be able to go through any layer as I doubt the curse effects something that's basically stone, they'd be able to avoid most threats on the first 2 layers being one of the fastest in their series, but will either be pursued by a splitjaw at layer 3 since it'll eat anything that's like a relic or be stuck at layer 4, regardless of speed the orb peircer can look 2 steps ahead