Well, I'm surprised I'm one of the very few people with interest in speedrunning this game. Oh well. 
So far I have a large chunk of the start of the game routed (Start to Elysion, or close to that) and I'm current at a bit of a loss. I'm pretty sure the best weapon combination for a large chunk of the game will be sword + shield (if run at BR 1, that is) and I've discussed the run a bit and figured out that there will be two major stonewalls in a run. These stonewalls are Namul Niram and gates of hell, due to the significant damage these two bosses put out, and the enthral mechanic in the gates of hell fight.
Currently I'm unsure if an upgrade path will be needed from the base shield, but I believe there is only minor improvements down the shield tree, thus it might be inefficient considering we only fight bosses. But then again as there are no random encounters in the run (due to wanting to remain close to BR 1 from the start of the run), the whole party will suffer from unupgraded weapons (except the few that get access to the special weapons at the six bases).
The other interesting part in this game is that potentially 4 extra towns may need to be unlocked to grant access to users of the 'hex' line of skills and the ilk (due to low BR and a highly probably lack of Paris or other psionic users, hexers are the only ones we can use to control moral, and from there we can't even get half of them due to a BR prereq). I currently believe that at least one group of hex users will be needed for the six bases (they kill groups of units really fast due to heavy aoe), but then again, Rush with Olibanum (gained for free after the Nest of Eagles) will hit pretty hard at BR 1 against a large chunk of enemies. From these 4 extra towns along with the main towns, minimal sidequests are needed to recruit characters (Baulson and Darien come to mind). Luckily after getting 18 party members, one can grab Zolean, who is probably the strongest (or one of the stronger) early hex users.
I'm weighing up bothering with unlocking Baaluk, Royotia (though Royotia has a hex user by the name of Joline) and Melphina, as the gains from them might be little. I believe unlocking Balterossa is worth it though, due to Caedmon being an amazing leader (though he does cost 19k to recruit) and later on in the game, Zolean is recruited there.
That is pretty much all I've figured out right now, though I believe getting 4-5 hex users is a key strategy, due to the chance of getting animalcule even in a low BR run (animalcule would effectively help cheese every large army fight along with the Gae Bolg). I'm not sure if anyone has much else to add, but I'll be working on this a lot harder after AGDQ and will hopefully get a run down (Given it is mostly a boss gauntlet with a few sidequests, I'm estimating between 3-6 hours regarding length).
So far I have a large chunk of the start of the game routed (Start to Elysion, or close to that) and I'm current at a bit of a loss. I'm pretty sure the best weapon combination for a large chunk of the game will be sword + shield (if run at BR 1, that is) and I've discussed the run a bit and figured out that there will be two major stonewalls in a run. These stonewalls are Namul Niram and gates of hell, due to the significant damage these two bosses put out, and the enthral mechanic in the gates of hell fight.
Currently I'm unsure if an upgrade path will be needed from the base shield, but I believe there is only minor improvements down the shield tree, thus it might be inefficient considering we only fight bosses. But then again as there are no random encounters in the run (due to wanting to remain close to BR 1 from the start of the run), the whole party will suffer from unupgraded weapons (except the few that get access to the special weapons at the six bases).
The other interesting part in this game is that potentially 4 extra towns may need to be unlocked to grant access to users of the 'hex' line of skills and the ilk (due to low BR and a highly probably lack of Paris or other psionic users, hexers are the only ones we can use to control moral, and from there we can't even get half of them due to a BR prereq). I currently believe that at least one group of hex users will be needed for the six bases (they kill groups of units really fast due to heavy aoe), but then again, Rush with Olibanum (gained for free after the Nest of Eagles) will hit pretty hard at BR 1 against a large chunk of enemies. From these 4 extra towns along with the main towns, minimal sidequests are needed to recruit characters (Baulson and Darien come to mind). Luckily after getting 18 party members, one can grab Zolean, who is probably the strongest (or one of the stronger) early hex users.
I'm weighing up bothering with unlocking Baaluk, Royotia (though Royotia has a hex user by the name of Joline) and Melphina, as the gains from them might be little. I believe unlocking Balterossa is worth it though, due to Caedmon being an amazing leader (though he does cost 19k to recruit) and later on in the game, Zolean is recruited there.
That is pretty much all I've figured out right now, though I believe getting 4-5 hex users is a key strategy, due to the chance of getting animalcule even in a low BR run (animalcule would effectively help cheese every large army fight along with the Gae Bolg). I'm not sure if anyone has much else to add, but I'll be working on this a lot harder after AGDQ and will hopefully get a run down (Given it is mostly a boss gauntlet with a few sidequests, I'm estimating between 3-6 hours regarding length).
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