Bouncers are generally pretty chilled out here in Switzerland. The higher end clubs will have them in usual suits, and the more general pubs or alternative scene discos may have them wearing more relaxes clothing, leather jackets, that kinda stuff.
Almost never seen a fight involving bouncers here, or a yelling match or similar... they just tend to keep the riff raff out, will tell you that the place is full or something similar. I've never had a problem with them, they may seem tame, but I don't think I'd like to pounce 2 or 3 of these guys on my own
They do tend to put on a very "Serious" face over in Geneva. A few will smile or joke around with you if you know them well enough, but otherwise they're all business.