I hold her as ESFJ.
She's helpful, representative, it's in her appearance.
If introverted she'd be ISFJ, but ESFJ really fits I guess.
Joey ESFP good one.
Phoebe really ISFP.
Yeah Monica ESTJ (I thought ESFP once, note how she loves to perform).
Chandler, Ross are hard. Ross Intj (some sort of scientist, little childish at times...), Chandler I have no idea. Extraverted, but for the rest... E, X, T, J...
What about ENTJ?