Not about a particular fandom, but I find that the worst behavioral aspect about foreign visual kei fans during lives is how so many have zero ability to control their emotions in the presence of their band. Like, I understand the excitement of getting to see our favorite artists, but damn can you not act like a raging fangirl who hasn't learned how to behave in public? Don't shout from the top of your lungs in people's ears and respect personal boundaries. I was almost hit in the face once by a girl who was jumping up and down and waving her arms like a maniac. We weren't even close to being in the front. You're surround by people, girl. Don't do that. I guess it's better than just standing around though.
As for violence and other types of shitty behavior (sorry for the tl;dr) : I feel like this is something you're bound to come across with if you follow rock music in general (especially if a good portion of the fans are girls and the band is made up of youngish guys) , so it's unfair to single it out as a problem within visual kei. I never experienced any shitty behavior towards me during foreign VK lives, but I have experienced it during lives for American bands and they basically mirror the type of behavior that other people have said they experienced during the VK ones. Like during one outdoor live (back when I was a teen) my best friend and I waited hours for the band we went to see to come onstage and we were upfront for only like the first two songs before the girls who had waited in back of us pushed themselves to the front and left us like in the third row. Then during another live, I caught the pick the guitarist played with and was shoved rather violently by the girl in back of me. I still didn't have a very good grasp on the pick since I caught it mid-air and when she shoved me, I dropped the pick . I reached down to pick it up, but the girl next to me (Not the one who shoved me) kicked my hand before I could actually grab it. I don't know what she hit, but when she did, I got a weird cramp that shot up from the back of my palm to my elbow area. She was bigger than me and I generally like to avoid conflict, so I just let her keep it. And then came the embarrassment I felt when I stood up straight again since I think the guitarist saw everything (or most of it) because he just smiled and waved at me with a sympathetic "I'm sorry" look on his face. Needless to say I prefer staying in the back now. Moral of the story: fangirls can be violent and they are scary.
I've always wondered how old Ryoga from RAZOR (ex BORN) is. If I had to take a guess, I'd say he's in his early to mid 30s, but I could be horribly wrong.
As far as "facts" go, I just know the ages of the boys from Nightmare, Hakuei (47) and Kiyoharu (49...50 later this month)
But now I'm also wondering the ages of the boys from Mamireta.