This is a build to give you an indech sword fighters/blue lion dancers/rally bot for minimum effort. It also gives Iggy the one other thing he wants for that: mobility.
Class Path
Soldier -> Cav/Thief -> Paladin/Assassin
Soldier is for repo but its unnecessary. Thief and assassin have a good movement type on the maps where horses don’t and they’re easy to access. They’re also not necessary. Monk certification might actually help for a desert map and its basically free so grab that too if you feel like it. True minimum effort would keep him in Cav all game.
Hitting level 20 with this type of build isn’t a given because none of the actions you deploy Iggy for give xp. If you do feed him enough the +1 move is worth it.
You could also consider wyvern rider. This usually costs his supportive gambit but a flying rally bot is good for some maps.
Rank Priorities
D+ lances and D riding -> A authority -> C swords -> C bows -> S authority -> C+ lances and C+ riding
Skill Loadout
The other skills aren’t going to matter. Prowess ig?