Tagged them.

Demo: WAR poured out damage and Termo made so many big plays. Plat was also very impressive.

Pocket: Yuki can hit just about anything, but Lansky really put 4G on his back in a couple matches.
Soldier play in general was incredible in this tournament.

Roamer: Blaze showed up big time. Seagull was Seagull, making all the plays. Tek rekt all.

Medic: Harbleu gets so many points for that Saw+Crossbow Bolt finish, but Shade was regular best-medic-in-tf2 Shade. Knoxxx also gets an award for most prolific use of Kritz, which was fun.

Scout: Hard to pick. Clockwork came alive as the competition went on. Squid+Enigma were working so well together. Sheep was insane, also on sniper of course, and his partner Snowblind was a surprise, very strong. Starkie went to work for AwS. Kiler also went absolutely mental. Also, shout out to Smzii, [R]eason didn't do well, but he was still able to show off a little bit of his scout prowess. Basically, there was a lot of really good scouts.

Offclassing: Sheep best sniper. Tek also made big plays.
... Clock best pyro. He sure can mash M2 well.

All in all, though, the level of play at this LAN was absolutely top-notch. So many great players, so many great plays.