Never seen that character before.
Yes, the difficulty with inappropriate peeing is - once medical issues are excluded and ruled out - finding exactly what the trigger is, and then how to deal with it. They're both indoor cats I think, is that right?
We once took on a rescue dog who had dreadful separation anxiety and would destroy all manner of things - carpets, wallpaper, shoes, clothing - you name it, she chewed it. It took months to sort it out, but we did, and I'm so glad we persevered, as she was the most delightful of dogs, with the sweetest of natures.
We then took on another rescue dog, years later, who had similar issues, and it was much easier to address as we knew what we were dealing with. Cats are more complex creatures thuogh, and much harder to figure out at times.