I'm glad I'm not the only one suddenly in some sort of Christmas spirit.
Alright folks, here's the thing: there are very few people who know the urgency of suicidal feelings and those who do know the sheer torment, pushing you closer to the edge with thoughts of escape. There aren't many words that can reach people who feel like this so if someone you know is feeling like this you need to get them professional help. In the meantime, don't leave them and hope against all hope that you can remind them of something to live for, if just for another day so that maybe, just maybe, you can get them help that can relieve their pain. You might just save someone's life (and, most importantly, if you fail it is not your fault. Biggest mistake of my life was blaming myself for a friend's suicide).
And if you are feeling suicidal, do anything you can to put off killing yourself for another minute or hour. Call a friend or relative, or call 1-800-SUICIDE or 1-800-273-TALK any hour of the day, any day of the week. What harm can it do? I know it doesn't seem like there's a way out but what harm can it do to just talk to someone for a measly few minutes? And who knows? Maybe you'll find some relief to that awful pain.
Not necessarily responding to you personally, but
THERE IS NO TYPE
The only thing that might distinguish someone you know as suicidal are sudden changes in demeanor or behavior. Which is why if someone tells you they are suicidal, believe them. You can't risk being wrong about it and not believe them.