What part of Wyll or Gale are edgy or negative?
Even Shadowheart is positive unless you pester her too much with personal questions.
How trustful of people would you be if you just escaped a mind flayer ship with a tadpole in your brain? Its also true to the lore that Clerics of Shar are very secretive, she is perfectly in character and normally nice to everyone except Githyanki unless you try getting too personal with her.
True, I should have stated that I was thinking more about the usual suspects - Shadowheart, Lae'Zel, and Astarion.
Both Wyll and Gale are friendly from the start.
Heck even Astarion's meeting conversation can go civil if you agree to his ruse and pass a Perception check to notice the knife before he manages to jump your character.
