Im sorry to jump in the tracks and completely throw you all of this raging subject. But it's only a character. If someone wants to /Properly/ play a suicidal character in a role-play then fine, so be it. It add's a little more drama into the role-play and sometimes it's actually fun to see how different people reach to, or how different people portray their characters. If someone wants to kill their character fine, It's theirs to do so with. This is exactly the same if you want your character to be a cannibalistic murderer. At the end of the day, it's yours to do with.
Lets not forgot suicide isn't a 'new' thing. It's happened for thousands of years, it's just not something that has been published as much as it is today. If someones is actually doing to do it, In real life, then you won't be able to stop them.
I understand some people are sensitive with some subjects like suicide or rape or abuse. But honestly, ( I'm so sorry if it makes me sound like a horrible person ) But if you don't like seeing it. Don't look. Don't be sensitive and get effected by it. You cant stop it, so just get on with it.
I've been through my own problems, some of the closest people here may know this. I just get on with. I suck it up and deal with it. I dont get offended, or get sensitive, I just think it's stupid.