Looking into the other CSs, I'm curious about a few of Enrico's potential interactions. Specifically with Hanayo, Evelyn, Sayaka, Kana, and Grimm.
Especially regarding both Hanayo and Grimm. Those two strike me as very good contrasts to Mr. Vivas in history and personality, respectively. The latter with his naive idealism colliding with Enrico's jaded realism, and that sword of his that's fueled by 'injustice' along with Enrico's injustices and want to make amends for them. In the former case, there's a person who has no obvious reason for wanting to destroy the Kimera Tenma with a person who should, by all means, have a vendetta against them but chooses not to. Lessons to be learned 'n' stuff.
In the case of Evelyn, Kana, and Sayaka, those three have their blistering (or in Sayaka's case, slightly lukewarm) hatred for the Kimera Tenma. Meanwhile, there's Enrico, a former member of the KT who's actually trying his best to make amends. Plus there's the plot tag that all of the trio's parents were assassinated, and Enrico was trained to be a Kimera Tenma assassin... Imagine what their interactions would be like if Enrico ended up being the killer (even though he probably wasn't BUT THINK ABOUT IT)