An ALL TIME lineup cannot be restricted to just one character per poster. It just can't. Not in my eyes. An ALL TIME lineup for me would almost have to split into various groups, based on how the characters function.
Field Team A-The Big Guns-JLA/Authority Danny-The instinctive, natural leader. The fluid that holds the group together. Everyone likes him. Everyone respects him. He works well with anyone.
Mick/Mxy-The man in the god. Brilliant, character almost impossible to get wrong. And where Mick goes, Shirley goes.
Tobias Christopher-A surly, young speedster. Somewhat standoffish, but still capable of having fun. I wish he would've stayed longer.
Turkish-The Prophet of One. Part Jedi Knight, Part Lei Mu Bai, Turkish combines several familiar aspects into a unique character. A monk who loves basketball? Who yearns to escape his responsibility and elope with his love, the heir to Camelot? Brilliant.
Grimm-How could he not be here?
Dirk Bell-Dirk is just too damn much fun to write. He's the monkeywrench in everybody's works. The guy who intentionally does the wrong thing to piss everybody off. How can you not love that?
Blackwulf-The jovial Russian changeling. Even he's not sure who he is half the time.
Banshee-Beautiful, innocent, and deadly. The irish songbird is decidedly female, but not too "girly." The romantic subplot with Grissom, has IMO, enhanced both characters.
Raptor-I have a personal preference for the obsessive, Ladnikia driven, troubled version of the character. The tormented soul, being pulled away from those he needs most against his will. A hero fallen, struggling to rise again, against seemingly impossible odds. Beautiful stuff.
Field Team B-Traveling Team-JLEurope Drake Marshall-Experience, ability, and a funny guy. Or at least he thinks he is.

Drake as a character has really come into his own since breaking away from the physical confines of being linked to Drax. The parallels to the flourishing of Notwedge as a writer at the same time go without saying.
Lady Lykopis-She's my Hyppolyta fix.

Fantastic. I love this character.
Zarch-An alien, tribal archer. Just one example of the amazingly unique ideas Mxy seems to generate without even trying.
Ozzy Baxter-A character who can travel down serious or humorous paths and pass between them effortlessly. We've barely begun to know him and I look forward to seeing problems from his past turn up.
Mason Templar-I didn't want to like him. My initial impression of the character was Dirk meets Blackwulf. Then I began writing scenes in World of Darkness and his voice made itself known. I truly miss this magnificent bastard.
Tayden-Tayden is another character with a surprising presence. Surprising because it's not overt. You'll be writing a post how to figure something out, and then you think of Tayden, and his charm, and largely unphysical abilities will more often than not take you through the situation.
Icarus-I admit to not fully having him down yet, but I really enjoy the basic concept. A modern Icarus, always on the verge of flying too high, but somehow managing not to. At least for now.
Field Team C-Covert-Planetary Grissom Montag-What else needs to be said at this point.
Sam Dawson-A brilliant character. Hiding his childhood scars with his morphing ability, Sam doesn't let his trauma hinder him from living a full life. Friendly, useful, and always there. Except when he's running away from the women in his life.
Edmund Gaunt-Tell you the truth, I'm surprised to see Gaunt making lists already. He's largely a work in progress, but I like him. I'm glad you do too.
Adem Different-Like Drake, Adem has flourished in the new group, and continues to inspire those who write him, and those who read him.
Nuriko-See my votes in the Kampies.
Nadia-I was writing the Siege and had no plans at all to use this character or how to do it when all of a sudden one night it hit me. Russian, spy, sexy, she's the Black Widow. And then things clicked into place and Nadia showed up in the story, surprising the team and the writer. Now I enjoy her and wish their was a more consistent way to utilise her unique talents in Vanguard.
Support Staff Doc Paragon-The money man. The mover and shaker. The guy would be the leader, if he wasn't so busy already.

Paragon sees the potential in Vanguard for improving the world in many ways. And uses his vast resources to enable them to do so.
Penny Goodweather-The classic hard working secretary, first to arrive at work and last to leave. No time for a social life. But she happens to be able to interface with computers with her mind.
Dr. Quantos-Ideally a mix of what little I know of his old MBL "Doc Quantum" self, and the current half retired scientist. Too old to work on the field team, Dr. Quantos supplies Vanguard with technologies unknown to the rest of the world.
Ian Mcgregor-I'm already trying to figure out how to work the stories so that the European team has to go in for checkups. Just to give him more screen time.
Jody Huerta-Oh, come on, with as many mental cases as the group has had, we need a staff psychiatrist.