I remember at some point in 4-2 that it's mentioned that Klavier became a prosecutor at the age of 17, and, as the spoiler-lovers know, the flashback trial takes place not too long after T&T, when Franziska is 19. Therefore we establish a closeness in age. Secondly, we all know that Franziska is a prosecuting prodigy as well [...you'd hafta be if you became a prosecutor at the age of 13, ja?], and Klavier...well...he's a prodigy too. We've established that they're both prodigies. Three: the Germany connection. Both of them are of German origin. Four: Both are younger siblings [I think if I remember right, MvK mentions his older daughter in 1-4, as well as his granddaughter, and unless Franziska was a teenage mother, it's highly unlikely that she's the older sibling. And Klavier is obviously Kristoph's younger bro.]. Despite the obvious difference that he's a "glimmerous fop" and she's a total hardcore, no-nonsense type, they have large quantities of things in common. Sorry if my explaination makes little sense or is a bit tl;dr. But that's just my explaination for it.

"I must say I'm used to being inspected by the ladies, but this is the first time I've felt this way with a man."

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Ema does seem extremely happy when she finds out that Phoenix kept her fingerprinting powder after all those years. Plus, Phoenix trusted Ema enough to come to her when he needed his pin-camera.

Kristoph: *painting nails ominously* Ah yes, you put me here, good chum. *vacant smile*

Phoenix: (I feel super uncomfortable here!)

I mean if Trucy and Apollo brother and sister I wouldn't mind seeing them

Look. Everyone likes Kristoph/Dahlia, because "Evil is hot". I've seen Aevitas' art. It's one of the reasons I started loving Kristoph so much. Anyways. Viola/Kristoph is less evil than Dahlia/Kristoph. And it's more workable. And it's beautiful. Hi-yah.

Though, I won't say no to more Dahlia/Kristoph art...

Viola says quite explicitly in 3-3 that she thought what Tigre did to Glen (i.e. poisoning him to collect his debt) was evil and despicable. If she knew that Kristoph was doing the same thing (to a 12 year old girl no less) there's no way she would support him. In fact she'd probably hate his guts and betray him like she did Tigre - Viola is a creepy girl, but the game makes it clear she could never take a life, or support the taking of life, especially through cowardly means (which Kris is guilty of).

You could probably ship them as Viola not knowing Kris' true nature, but that presents a problem, too: all we know about Viola romantically is that she was in love with Tigre: that is, she was in love with a loud mouthed brute of a man, if only because he threw himself at her feet. That's pretty much the complete opposite of Kristoph. Which isn't to say she can't have a broad taste in men, it just doesn't mesh with anything we know about Viola in canon.