I shall give you my preferred DLC picks for each class, and my reasoning.
Emet: Emet is an amazing character. Incredible dialogue, hilarious personality, and a phenomenal kit. I love everything in it. His healing buoys provide an interesting new healing mechanic to the game, as does his respawn beacon. His replay cannon also helps out a lot, but it’s definitely not a defining feature of his.
Kala: Kala provides a new and interesting way to play the game that really appeals to me, in a strange way. Setting up traps for monsters, wiping away their armor for a limited time to hit home, and the ability to teleport… It’s crazy. It requires you to think smart, a lot smarter than you would with other hunters. Kala isn’t an easy Hunter to pull off, but if you can, it’s a very rewarding experience.
Gorgon: It may not appeal to everyone, but I like quick, stealthy characters, and Gorgon definitely fits this niche. She’s got some intense DOT action and trap laying prowess that is really fun to play. You have no idea how badass it is chilling on a wall and lying in wait, spewing acid and leaping onto the hunters with malice. It’s awesome!
Jack: He’s just a fun character. It’s cool using the survey satellite, as it requires you to use a lot more of your intuition. His repulsor makes you feel like a total badass, stopping twenty-foot tall monsters in place. His pistols are really nice too. All around, he’s a real funny character with an interesting yet simplistic kit.
Torvald: Torvald is a revenge bound cyborg with a death wish, and his kit is absolutely insane. Frisbees that make yourself stronger… A shotgun that absolutely shreds through monsters with a single click… A mortar cannon mounted on your back… What’s not to love? He’s a cool character with a crazy agenda. I like it.
Now I’ll go into the other DLC characters and my reasoning for not choosing them. It’s not that they aren’t good or interesting. It’s just because they don’t fit me.
Slim: I like Slim. He’s cool. He’s my second Hunter elite. But God, his spores man. I hate the new VFX for them. I realize that it was needed so colorblind individual’s heads didn’t implode, but still. I just… Can’t play Slim anymore.
Sunny: I’ve just never really been too fond of defensive supports. Her JPB is nice, but her mininukes don’t have a high enough rate of fire to keep me in the game, and her shield drone is just kind of there. She just doesn’t feel engaging enough for me.
Behemoth: He’s an amazing monster. My third favorite. But as I stated previously, I like fast, stealthy types, and Behemoth… He’s none of that. However, I love his abilities (probably more than Gorgon’s, in all honesty) and he’s a great monster, contrary to some’s beliefs.
Crow: I’ve just never really been a big Crow guy, honestly. He’s cool. Gobi is awesome. But I’m not into the whole, charging your shots mechanic. I’m also shit with his aiming.
Lennox: Lennox is a great character. Her kit is amazing. She’s right up there with Torvald in my eyes. But God dammit, if her personality isn’t bland as all hell to me. I can’t play her because I simply hate her dialogue. No offense to anyone at TRS, but just… Yeah. I just don’t like it. Personal opinion, obviously. I love Sunny’s dialogue and VO but a lot of people hate it for some reason.
What you should be looking for in your chosen character is…
Class Preference: You like trapper? I’d role with a trapper then.
Design: Does their design appeal to you? I personally love both Crow’s and Jack’s design.
Personality: Do you like their personality? Crow seems slightly bland to me, but Jack’s personality is pretty interesting.
Kit: Do you like their kit? I love Jack’s kit, but Crow’s kit is eh to me. Love Gobi, though.
Playstyle: Does their playstyle appeal to you? Crow and Jack have two very different playstyles. Much different tracking, much different CC, and much different weapons. You just have to find the gameplay mechanics that “feel smoothest in your hands”, so to speak.
Hope this helped! I’m not trying to sway your opinion. I’m just trying to help you choose the one that’d best fit you, by listing the ones that best fit me. Everyone is different, so your choices (and many others’) may be drastically different. Whoever you choose, I hope you enjoy them. Have a good one!