[captain]

Very subjective question. You have two answers really, one that looks good on paper and one that actually works.

On paper: 4 x Enchanter. Obviously in a perfect world everyone would be an enchanter and just charm everything!

Actual: 1) Shaman - Malo, Slow, Torpor + buffs are immensely powerful in small group play.
2) Monk - Pulling, DPS and if geared well enough can tank mobs that are slowed by Shaman.
3) Cleric - Since your question leaves room for only 4 and not any alts parked out, you will need someone to rez when you eventually die. CH + Aego aren't a horrible thing to have either.

4) A) Rogue - Best sustainable DPS without much of a gear requirement. Works well with buffs from shaman and can help sneak tag pull for monk. Once mob is slowed shaman can tank with cleric heals while rogue can still stab.

B) Wizard - Very gear dependent, but a wizard with epic+rend robe have the sustainable DPS to contend with rogue. + Ports unless you like to run across every zone(again because of the way your question is worded).

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Now this is P99 that we are talkin about, the server that has been on Kunark for years, so if you have been around a while and only have one character then you have the dedication of ghandi and I salute you.

In this scenario where you will have 4 players I will say that each one has a Main that they will play during encounters and 1 alt that can be used for different reasons.

1) Main: Shaman - Same reasons stated as above.
Alt: Enchanter - Parked for buffs
2) Main: Monk - Same reasons as stated above.
Alt: Cleric - Buffs & parked for rezzes when you FD and group wipes.
3) Main: Rogue/Wiz option
Alt: Warrior - depending if you come upon a boss type mob that the monk can't tank.
4) Main: Rogue/Wiz option
Alt: Wiz/Druid for ports in-case you go double rogue, otherwise Cleric to switch out to heal Warrior. Also if monk dies you can rez him on this char.

In this scenario you can also switch entire group to alt's where you will have a warrior + 2 clerics for CH rotation and an enchanter to charm. If you have more friends that log on your 4 man team can turn into the core group needed for any raid target!

Thanks for the early morning theory crafting.