“Second of all, you should all hear the ideas that Adam I. had around an Agent. Pretty cool stuff. I will tell you that this is not the last character, but we all love to sit and chat about how things would fit into KI. Designers are wickedly incredible at their jobs.” -rukizzel
https://forums.ultra-combo.com/t/any-hope-for-last-character-be-entirely-new/
Oi! You guys need to chill- Not only is mystery fighter #3 NOT the final character, there’s more on the way. I seriously believe this is the quiet before the Season 4 Storm. Cheer up buttercups! 
-Zenek