Thread:KodachiZero/@comment-28010705-20170802130225/@comment-3215051-20171006134118

Japanese has another association for "Chain" since Kizuna also means bonds.

In the case of Chain Chronicle, I believe it's based on how everyone's fates are bound together and linked to one another, as it's the main selling point of the game.

Chain Heroes are characters who have impacted the Chronicle in a very large way and the fate of the world itself. That's why the Volunteer Army + Chain Story main characters are the ones with Chain Hero abilities. Apparently they've decided to consider both Lilith and Teresa as main characters of Lilith's chain story so that's why we have them both (Though honestly it's probably just because they wanted to capitalize on a heavily-implied femalexfemale romantic relationship). [Zero]