I believe Tryndamere suits you best if your natural playstyle is extremely aggressive. You are the kind of person who HAS to run in to a crowd and go crazy. All the time. There is no other option, or else you can't even enjoy this game.
Why wouldn't a tank suit these maniacs better, you might ask? The answer is simple: As much as you demand this playstyle, you also demand someone who can deliver in terms of dealing heavy damage with high speed.

You want to kill. You want to steal kills from others. The only thing you care about in this game is how many kills you have when the game is over.


Also, the hand on the top right corner does NOT symbolise how many assists you have, it symbolises how many kills people have stolen from you and nothing else.

Masteries


21/3/6. You want as much damage as possible and armor to back up your playstyle. Therefore, we max out the offense tree.

Runes


As mentioned, we want as much damage as possible and armor to back us up. We want to penetrate.
Greater Mark of Desolation x9 for armor penetration.
Greater Quintessence of Furor x3 for critical damage!
Greater Seal of Alacrity x9 for attack speed.
Greater Glyph of Malice x3 for critical chance.
Greater Glyph of Furor x6 for critical damage.