I've had all five of my character slots taken for a while, but I've found that I don't play on my Ranger that much. I'm not sure why, but I guess I just don't find the class that interesting/fun. I boosted her up to 80 and played a bit with Druid and Soulbeast, but I don't find myself playing on her that often- she's turned into a bank character. I also want to make a Charr so I can get the Charr personal story achievements (Bloodying the Past, For the Legion!, and From Howl to Silence), whether I keep them or not.
My other four characters are an Elementalist (Weaver), Necromancer (Minion master Reaper), Engineer (Holosmith), and Mesmer (Chronomancer).
I really love playing on my ele, and recently I've been playing on my necro and engi more. Most of what I do is open-world PvE, but I play fractals and dungeons occasionally (although only on my ele).
(my ranger's still 200 days away from her first birthday, so I really won't be losing much by deleting her.)
I want to make a character from a new class, so what would you suggest? Warrior, Guardian, Revenant, or Thief? Or do you think I should just go down to four characters and make a weekly BL key farm character?