-Threadhopping with this character - yes, no, or what?: Sure, go ahead. Though if it's marked private or really long, it'd be better to ask first.
-Hugging this character?: Not only do I allow it, I encourage it. You can even carry him around~! He's rather light.
Giving this character a kiss?: Well, he looks seven...but it'd also make for lulz if you want too?
-Punching this character (provided they are given an opportunity to fight back): Well, again, he looks seven, so I doubt anyone bigger than him will feel all right doing that. But sure, punching is okay. Just expect a super charged soccer ball in response.
-Is there anything YOU DO NOT WANT MENTIONED near this character?: I'm fine with anything mentioned around him. However, for people who either canonly knows his series (like Shiho supposedly does) or psychics, don't go mentioning he's Kudo Shinichi in front of others please? You can tell him you know who he is though. He'll flail. =D
-Is there anything you need us to KNOW about interacting with this character? Special physical features, fighting abilities, STUFF: He has a bunch of gadgets. Like, half of his outfit is some sort of device. Also, those glasses? No prescription at all. Other than that, Conan is an observant little bugger and will likely pick up a lot from the littlest thing. Also, if he thinks no one is paying attention, he lets his teenager face show through.
-ANYTHING ELSE PLEASE MENTION HERE: ...he's INCREDIBLY short. He's not much taller than a toddler. =/