You should put at least 1 point into
Ignite. People will like you better in TMQs for having an AoE attack. I don't like having anymore than 1 point in
Kami's Desire either. Getting only a 10% better chance for spending 2 points doesn't sound all that promising to me (I also rarely ever use it). Other than that it looks good on the non-Summoner tree.
Not really sure about which summon you should be getting, but the
Kami's Blitz skill looks really nice. Summoners seem to have a bunch of useful party buffs and might end up being some sort of mix between a party buffer and a damage dealer. So you might be expected to have that one in the late-game.