[Chaos]

Okay

instead of buffing youkai health, which is unneccessary because they need to be able to die.

youkai summoned without fast offense could be summoned with a summon shield, basically a passive for summoner that makes summoned youkai (summoned regularly) summoned with the guard status at rank*2 level

Buffing Youkai HP doesn't make them suddenly immortal. They have holes in their defensive stats, inate weaknesses and anti-Youkai skills/equipment/etc. to keep them from ever being too much to handle while on the field.

The idea of making Youkai near-invincible on the same round they're summoned (w/o FO) is tempting. However, I honestly have to question if this will be a good long-term solution. It ensures that Youkai can act, but does nothing to really help with the unforgiving frailty that most Youkai have.