Summonable avatars - List which ones you want to see implemented

[Selzak]

I'd like to see something that doesn't require Astral Flow.

Why not include Avatars with long recast times or other limitations instead? Change the utilization up a bit.

Bahamut, 5 min. recast.
Bahamut has powerful BP's, but does not melee. Flare attacks could be heavily based on range (it will never engage, and the SMN can use this along with some skill to adjust Bahamut's range to the optimal distance).
AF would let you use Mega Flare.

Phoenix, 15 min. recast.
Relatively weak, mostly used as a safety net or a placeholder (like a rebirth) for next summon. You can summon Phoenix while another avatar is out, but once summoned the other avatar will disappear- you would not have two avatars at a time. Phoenix would have no BP's and weak melee, but instinctively casts Raise (scaling with level) on anyone within the player's alliance (within a large radius).
Phoenix has an inherent trait that allows it to remain active for 20 seconds after the SMN is defeated. Within that time (if it is not defeated), Phoenix may cast Raise on the SMN (within a large radius).
AF could grant a "Rebirth" AoE effect on party (not alliance) that does not leave the targets weakened- Phoenix disintegrates, leaving a single feather that falls to the ground and revives the party. AF effect ends after one use.