Hello and welcome! My name is Callie and I play Xerxes Break from Pandora Hearts, and Break's got super duper close CR with Ange. Long story short of all the traumas they could possibly share it's "one time my whole family got massacred in the span of a day while I was not looking and it kind of ruined my life", and so they've speedrun the adoption route and now he's her eccentric Victorian uncle. At the same time, while he's firmly Team Ange, he comes from a canon where traumatized people (himself included, though this is a secret) tend to end up in Contracts with demonic entities and commit a lot of murder over it. Because of this he's not without understanding of how and why the whole witch thing happens, and in Trench he goes the route of wanting to help people ease and overcome such feelings, since corruption can spark such things in everybody at any time.

You can see why Beato is relevant to his interests. Break is a darkblood himself and when Ange lets him know Beato is around, he'll be practicing with his powers explicitly to defend and then fight against witches just in case she ever needs him. But! He won't be openly hostile to Beato until she gives him a reason to be as he values sensible truces in this world where you can't solve your problems by killing them, and she can feel free to notice that when he isn't being a horrifying professional swordsman he's basically a weird fake AU Ronove right down to the cookie-baking. He's far too devoted to Ange to ever truly be Beato's friend or Sayo's, but whenever he's in a position to offer support to them that might prevent gross or violent drama down the road, he'll take it. After all, their stability also affects Ange directly.

Looking forward to seeing how things play out! I loathe discord but am happy to plot over PMs, and if you do need to grab me on plurk I'm @ blithering. Again, welcome!