Heavy
Knight (Final Fantasy) vs Celes Cher (Final Fantasy VI) - Good news for Knight, I don't give Celes access to Meteor. Bad news, she probably won't need it. Transformative status is not a thing in FF1 outside of petrify, so he doesn't have a good way to block Imp.
Light
Saleh (Fire Emblem: Sacred Stones) vs Kain Highwind (Final Fantasy IV) - Kneejerk here, but Kain goes first, already has decent magic durability, Jump has an actual use here in halving the number of counters he faces, and he resists the elemental spells that Saleh would use. Also, Saleh is a frail FE mage, news at 11. [EDIT]: Doubling down on this now that Jump apparently ignores counters. That *really* takes the bite out of Saleh here.
Chu-Chu (Xenogears) vs Tricia (Soul Nomad & The World Eaters) - This one's actually a bit tougher. I'm willing to put Chu-Chu as neutral affinity here (splitting the difference on her advantage versus casters but disadvantage versus Beast types). ...however, her best damage (which is still 50% of the cast average) in most cases will run into Tricia's RES. And her best nonmagical damage hits for about a third of that at base. ...furthermore, both have miserable damage in this scenario. ...I would say heal-locking is possible, but Tricia would rather wait for a double (it will happen, Chu-Chu is slower, can't counter and is going to, what, 18HKO average?), pop High Ground and throw out two specials there. That should be enough to kill the small pink fluffy thing. Almost thought Chu-Chu might have won this by attrition. Possibly Tricia's hardest match this season unless she somehow fights Kain in the finals. [EDIT] Of course, if you take Chu-Chu as a pure caster then it's an absolute curbstomp
...why the hell did i spend so long analyzing the Light matches