Summon Board Passive selections:
NOTE: The sphere letters below are hyperlinked to our Sphere Hub which lists all available spheres sorted by effect!Brothers choose 3 / 4 / 5
Odin choose 3 / 4 / 7
Bahamut choose 4 / 5 / 6
Usuals:
Ifrit, Shiva, Ramuh 4 / 5 / 7
Leviathan, Pandemonium, Diabolos, Alexander 4 / 5 / 6
For more details and help with summons, check Summon Hub!
A Sphere - ATK & BRV DMG are technically most important. mBRV spheres are good alternatives as even if he doesn't do as much BRV DMG, he can still battery himself well based off mBRV. If you're fully sphering Guy because he's a fave, then you certainly will still opt for ATK/BRV DMG.
B Sphere - His own sphere great for him. Gabranth or a refined (RF) Gabranth sphere is great. Celes’ sphere is also excellent, but note that her sphere is one of the best for characters that have B slots but don’t have the Lock debuff, so you probably want to save it. If you wanted to max his damage, clearly a Gladio sphere would be amazing, but this is better suited on a damage oriented tank.
D Sphere - Really any ATK/mBRV D sphere that is not Wakka
Generally, Guy opens with EX to drop his imperil up front. You can then use his AA (Weak Damage Up All) for a free to boost the party’s BRV DMG further, and then use his LD to set up all of his buffs. Finally, use War Cry to lock enemies and max his stacked buff.
Guy is fairly easy to use, since all of his skills are AoE. Use your skills to maintain your buffs & debuffs! Keep them up always.
War Cry (S2) is your way to keep enemies locked on Guy and protect your party. Just be sure to keep him above 50% HP to maintain his Last Stand, which will prevent KO.
Gaia Rumble (EX) is up after 2 skill uses, so let’s do some longevity checks…
No AA Weave: (EX > 2 skills), repeated 16 times = 48 turns skill spam (~144 turn quest)
AA will be active for 8 turn cycles
Weaving in AA: (EX > AA > 2 skills) + (EX > 2 skills), repeated 5 times = 30 turns skill spam (~90 turn quest)
AA will be active for 28 turn cycles (start to consume uses of your AA late in the battle)
This clearly indicates that Guy can freely use his free skill use on AA with no impact to his longevity, as few fights extend past 90 turns
Gaia Swing (LD) is your go-to imperil button if your EX is not charged and if the enemy has cleansed Guy's debuff or removed it in some way