Soki's assist is his light shoulder tackle, however it doesn't retain the same properties as the original. It merely lifts the opponent off the ground a bit and knocks them back, but does not stagger or knockdown. Pretty poor as far as assists go, but it does cover a good amount of distance and has a large hitbox.
Soki's Variable Counter uses the same animation as his launcher. It's quite slow as far as variable counters go, so one may want to think twice about calling Soki out for a Variable counter.
Variable Hyper Combination
when summoned to perform a Variable Hyper combination, Soki will use his Flame Sword super.