So, thinking about the Rally, Inspire, Fortify thing more, and assuming those front page stats are still mostly accurate:
Inspire on an Archer. They can buff a Fire Sage or Wind Strategist without compromising their own position. Might get some opportunities to buff a Valkyrie or Seraph Knight too. Leonardo's all ready got Longbow + Disarm, so I'd guess either Rolf or Shinon. I'd guess Shinon. He's got more skill for Longbow use, so his position is more flexible. Rolf, meanwhile, has much higher strength, so I'd guess he's much less in need of a "team buff" to be effective. Not sure on the synergy of an Inspire Crossbowmen.
Inspire on Devdan. Just 'cause. Oh, and for buffing Fiona.
At least one of the Valkyries or Seraph Knights could use one as well. Could take either Rally for frontline troops & backline Archers or they could take Inspire for backline mages. Not Elinicia or Fiona - they've got Amiti and Move+1 all ready. Also, probably not Tanith, because I'm guessing she's going to be the hardest hitting of the female horises. So...one of Mist, Astrid, Marcia, or Sigrun.
Blessing + Fortify on Leanne, axe Paragon. > : ) Could also do a Blessing + Fortify Valkyrie or Seraph Knight. > : )
Fortify Oscar to contrast Rally Kieran. Bit of a yin & yang thing for those two. Also, Geoffrey's a Paragon user, and by the front page's stats, once you get him back in Part 4, he basically overtakes Oscar anyways. Course, you lose Fortify Geoffrey for Part 2 - only played FE10 once & I don't know what's happened in your mod, so iunno if Part 2 Fortify is more important tactically.
I'll second the Fortify Pelleas, as well as some of these moves on some of the Armor Knights. Dunno which one is best for which though.
Haven't thought about the Laguz at all. So, that's all I got.