Board Thread:News and Announcements/@comment-4698889-20180724122634/@comment-181.66.27.38-20180906201118

Misstress of the heavenly yard wrote: Arth's design is based on Len though.

Ichika said that his design is based on a adult version of Len. This is probably because he wanted to do Arth similar to Allen. However, Arth shouldn't be identical to Allen (since Arth's his father). So, I don't think we can assure that Arth is a Len character.

Behemo and Levia aren't Len and Rin characters, even although they have their voices.