User blog comment:Mukiiitee/Irregular (s) Theories/@comment-33638727-20191005152830

first of all

in theory no.1 it could be but we know that there is power in the outside world and we know all the weapons in the tower were designed after the shape of the weapons Jahad and his companion brought to the tower

so I do not think they are normal and then gain power

but they do also gain few things like we know all irregular have high shinso resistance but shinso does not exist outside the tower so they gain this ability when they enter

for No.2

first, you need to understand normal regular are chosen by headon (guardian of the first floor) while all irregular are chosen by the tower itself

so far we know from the story the irregular is the one who opens the door themselves

also that they are chosen by the tower

my theory is when the tower choose you it will show the door in front of you and it is your choice if you want to open it then enter the tower

also as fact, all the normal regular were born and raised in the tower while all 18 irregulars came from the outside world (not the real world but outside)

also, we know that inside TSU there many stories and I think many world's