Suikoden is played mainly serious. There are some minor comedy bis throughout but it tends to be all about war, and the usual Japanese preachiness about war. Have you ever watched a Gundam series? Suikoden is basically exactly like that. Right down to "You start out on what should be the good guys side until you realise they are bad guys so you join the bad guys who it turns out are really good guys, except they are bad guys now and you have to make your own side to be the good guys and end war forever, with superior firepower if necessary oh and someone is trying to blow up the world!"
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Epsilon
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Epsilon