[Snake]

Out of everything proposed I think only Aliagmato needs any big attention. Mostly at its momentum cost, which is extremely crippling. So it's best if the skill gets it reduced from 4M to 3M. Also... The other problem I find with it is that Youkai can't hit shit. So I suggest making them have a 100% chance to hit if they're dashing under the effects of the skill. (And really, this is the only skill that gives Youkai some teamwork credit.)

Ritual Sword could have its range increased by (Rank) tiles, and also make you dash towards the enemy. And as Miller said up there, a bonus to hit instead of damage, since Bonder can't help itself.

Riagri is too snore-worth to need any attention, in my personal opinion. Maybe it could summon the Bonded Youkai when it hits something?