Deku:very timid,reserved+polite,frequently overreacting to abnormal situations,insecure,tearful,vulnerable,and non-expressive,takes care of Shoto, carries a sword,cautious,startled easily,acts like Shoto’s brother,16
Shoto:normally calm and composed,1,acts+talks like a baby,protected by Izuku,cries when scared,scared by dragons+strangers
Story: fantasy au,there are dragons+other mythical creatures
Izuku/Midoriya/Deku isn’t related to Shoto/todoroki biologically