First: AvahZ Darkwood (N/G)
Half-Elf Fighter/Druid or Paladin (Oath of Ancients) depending on how it’s implemented.
Will save everyone at grove. May use illithid power up to first ability.
Second: Cobalt Walker (C/E)
Human: Paladin Oath Breaker if possible. If not Paladin/Warlock patron Atropos (Great Old one if I have to would rather be The Undead)
https://forgottenrealms.fandom.com/wiki/Atropus http://dnd5e.wikidot.com/warlock:undead
Will side with the Goblins to ruin the grove to spite Sylvanus. Hates the gods and all they stand for (All thing’s die and so should the gods). Will not use the illithid powers.
Third: Myst Windlore (T/N)
Elf: Sorcerer (Silver Dragon) specializes in Ice Magics (No not a Disney copy lol, she was an original in og BG)
Will save all in Grove. Will use illithid power, may stop at first power.
Fourth: Rah Rah (C/N)
Drow: Bard/Thief
Will steal idol for Mol and thus kill Druids. Kill goblins (Not a Spider Queen Draw) Will use illithid power sparingly. Will join the Zhentarim. Yes, you can join them in EA. Have to be a Thief and convince (don’t remember his name) the guy you saved from the gnolls to sell the chest.
But wait there’s MORE

Fifth: Zebulon (C/N)
Tiefling: Barbarian
Will kill Druids, kill goblins and use the illithid power how ever he wants.