Yes, Tux is still quite skittish at times. When we first brought him into the house, as a small kitten, he started ambushing the other cats and then hiding where they couldn't catch him. Cammy, our mother kitty, took it on herself to discipline this juvenile delinquent since it was obvious he hadn't the care of a restrictive mother. I think he resented her abuse but did give her respect. The other cats eventually put him in his place. They tolerate him, but I don't think, really like him too well.
Even though neutered, he took to spraying the walls, and he will attack our 13 year old female Siamese. We took him to the vet over his behavior problem. The vet prescribed tranquilizers, which didn't curb his aggressive behavior toward our Siamese. We then opted to make him live outside. He started in our garage and ended up back there. We got him a doghouse with straw and put it up in the attic. We still allow him inside but limit his movements in the house. I'm curious about his behavior. Could it be because he was born feral? The vet said he is aggressive toward Coco, our Siamese because he can. He had hurt her badly, hence you can see why we banished him from the house, except under strict supervision.