Jwunder

Junkrat is my favorite for maximum havoc and mayhem. Good for any map in either defense or attack. I am constantly pulling the trigger the whole time just getting random kills from ricochets. I also kill myself on occasion. Also rarely given credit for his vertical mobility.

D.VA is great as well easy to get 20+ kill streaks. Her little laser has good damage and range. Awesome for ruining a Torbjorn's day.

Mei. My god. For defense. If I only could get play of the game for harassing the other team and pissing them off. If two or three players are standing around waiting for my ice block heal to end so they can kill me because I pissed them off so much, then they aren't pushing the point and I have done my job. A character I completely ignored during the beta now one of my favorites.

Honorable mentions go to Symmetra, Genji, Hanzo, Reinhart, Lucio and Zarya

I've been using mining lasers on my turrets. They kill small stuff instantly and take down shields on bigger ships very quickly, but their range is short. Flak cannons on my secondary. Upgraded version of the starting weapon for broadsides but I'll probably try something else there soon. I'm in the Mastodon now. You keep your weapons and upgrades when getting a new ship. Also, get a smugglers hold as soon as possible.