Board Thread:General Discussion/@comment-44056425-20200211053453/@comment-44993037-20200211104038

well their names end on -maru not -maro and ashera was explained, sika wanted to give him a name that sounds more like the tongue of the land they were traveling to (which is likely japan) so he changed ashera to asuramaru, both names end of the kanji 丸 which can be read as maru (i cant say 100% cause kanji are way to complex for that and i am a noob) I'm assuming someone from Japan made shinyas demon weapon gear as tigers of the size shinyas demon is carrying were never native to japan i think

or the author just wanted to give them japanese names i doubt shinyas demon is from japan originally just like ashera and krul arent - so yeah i think "casualness" is the most fitting - though afaik there always goes thought into chosing kanji when naming someone or a character so that it is fitting - like the trivia that yuus parents chose to write his name with a kanji that can stand for tenderness and gentleness in hopes hed be gentle and kind