[scc]

So you've saved up your points and brought a level of Planar Summons, so what can you actually summon?

Demons are the classic answer, but they've got their own spell for some reason.

Angels (or other celestial servitors) then! Well they're not always available (some setting allow demons but not angels) and if demons require a separate spell angel should as well, or at least use the same one as demons.

There are again separate spells for elementals, but the way the spell is written it's not a proper inter-denominational summoning, rather calling something somewhere near to you, coupled with the fact that there are spells to create these elementals it's likely that they aren't proper elementals but rather servitors created by humans, it's quite possible that 'real' elementals can be summoned by Gate magic.

There's a Summon Spirit spell, but that just allows you to talk to the dead, and I'd make the recent dead, so Gate-ing in things like Valkyries and Einherjar from a death-realm are possible.

Djinn are a possibility, assuming your GM is that free with wishes and you feel confident enough to take the chance summoning something that tricky.

Any suggestions? Could the monsters out of Greek and the like myth be summonable? And where from?