Each type of interaction is different, and aside from Napoleon and Illya's classic interaction, only Ecks and Wye have spoken to each other in canon at all (and there only briefly). Hence, there is a lot to fill in. I had to glean what I could from Ecks and Wye's brief time onscreen and flesh out all the rest: their personalities, how they interact with each other, and how they interact with Napoleon and Illya (and occasionally, Mr. Waverly). It has honestly been a blast.