rickardspaghetti wrote:When do you use ちゃん and さま?
<ちゃん> should be used mostly with young children and also when a man is talking to a young woman whom he knows well.
Milantex touched up on <様> a bit. I should point out that Japan does not have a president. Their head of government is the Prime Minister. The head of state is the Emperor.
I don't think you'd use <様> with the Prime Minister but you definitely would with the Emperor. Although not with his name, you have to say <天皇様>.
Generally, <様> isn't used much in modern Japanese with people's names, only with certain titles.