Gintama is my favorite anime and I highly recommend it. Most of Gintama is hilarious with laughs and more like comedy-action but it does turn serious in a few arcs, and when it does expect blood to fall and preconceptions of the characters to be destroyed.
Baki the Grappler is focused around fighting. Every single episode there's a fight happening and it's extremely fucking epic. If you're looking for just raw action then this is the anime you're looking for.
Hunter x Hunter is another one of my favorite anime and it's got one of the most unique fighting system in shounen anime. Do NOT take this for a kiddy shounen or the main character lightly, shit gets serious fast.
Tengen Toppa Gurren Lagann is a mock parody with mecha and it has some of the most inspirational and badass characters out there. Lots of badass fights.