[FF7 Rebirth] To Be a Hero in

Some rounds can be a 1-2 seconds faster depending on the enemies attack pattern.

Build at the end of the video and in the comments.
I wrote AS / SM in brackets after the command triggering ATB Stagger / Skill Master.

0:00 Titan
ATB Boost, Prime Mode, Sonic Boom. Then strong attacks, parry/counterfire, Aeroga (SM) to break Earthen Aegis. Aerora with Sephiroth + Aeroga (SM) to stagger (AS), Aeroga to kill. If Sephiroth doesn't have enough ATB for Aerora: Aeroga with Cloud (SM), then light attacks to stagger (AS).

0:54 Ogre Rider
ATB Boost, Prime Mode, Sonic Boom. Parry/counterfire its first attack. Full combo of strong attacks, then ready to parry/counterfire once more. Thundaga, immediately switch to Sephiroth to fill 1 ATB bar and cast Blizzara. Back to Cloud, full combo of strong attacks, Thundaga. Repeat the same combo, parry/counterfire, Thundaga again.

1:48 Phoenix
Attack with Sephiroth to almost fill his ATB. Prime Mode then Sonic Boom to kill the mobs. Cloud absorbs all attacks except Blazing Onrush (block it). It seems that following Phoenix around makes it attack faster, but maybe I am wrong. Be sure Cloud is in Berserk 1 or 2 and close to the Grandhorn when he casts the last Sonic Boom. At the same time, Blizzaga with Sephiroth on Phoenix. Attack with Cloud to stagger (AS), Thundaga (SM), ATB Boost, Thundaga.

3:24 Sea Dragon
Prime Mode, two attacks (one light, one strong), parry, two strong attacks for Berserk 2, Sonic Boom. Parry, strong attacks to fill ATB, Thundaga (SM), ATB Boost, Thundaga.
You can counterfire its Hurricane.

4:00 Kujata
Prime Mode, dodge to cancel animation, then parry/dodge its first attack. Do short combos and buff Cloud with Plasma Discharge but NOT with Sonic Boom. Instead, cast Thundaga (SM). If you have full ATB and Kujata attacks, cast Thundaga. If it summons an "elemental", wait (be sure Cloud has full ATB, and possibly Sephiroth too).
· Scenario 1 (in the video): the elemental is fire or ice. Let Kujata take it, then stop it with Thundaga so it doesn't take the second. Cloud absorbs all attacks. Cast the opposite -aga spell with Sephiroth, then fill Cloud's ATB. Sonic Boom, -ara spell (SM) to pressure, ATB Boost, Thundaga.
· Scenario 2: the elemental is lightning. Let Kujata take the second as well (ice or fire). Cloud cannot absorb lightning attacks. Aeroga with Sephiroth, Sonic Boom, Aerora (SM) to pressure, ATB Boost, Thundaga.
Note that, in general, you need one -ara + one -aga spell to "remove" the elemental and pressure Kujata.

5:37 Jabberwock
ATB Boost, Prime Mode, Sonic Boom, then parry/counterfire its attacks. You can counterfire Lithic Curse, breath attacks, and stomps. Firaga with Cloud and Fira/Firaga with Sephiroth (depends on his ATB). Attack/parry/counterfire again and cast one last Firaga/Thundaga/Fira (depends on how much HP it has left).

6:25 Alexander
Prime Mode, strong attacks for Berserk 2, and Sonic Boom. Counterfire Earth Tremor and Tracking Beam if needed. Be sure to have full ATB and cast two Thundara (SM) to cripple both arms (if you wait before crippling the second, Alexander may teleport). When Alexander is pressured: attack, Thundara, fill ATB, Thundara, ATB Boost, Thundaga.
DO NOT cast Thundaga first or Alexander will regenerate its arms.

7:10 King Zu
ATB Boost, Prime Mode, Sonic Boom, Plasma Discharge (SM), then ignore the wings and just attack the main body. It will die with two Thundaga without having time to use Swan Song.

7:57 Bahamut Arisen
Prime Mode, dodge to cancel the animation, then parry its kicks. Counterfire its magic attacks a few times to pressure (Nova Bomb, Flame Breath, Thruster Spin, Vulcan Onslaught). Its third attack is ALMOST always Crush Grip: interrupt it with Thundaga or dodge it.
Use Plasma Discharge and Sonic Boom (SM) after a parry/counterfire. Cast Thundaga when Bahamut is pressured (Sephiroth may cast Thundara if he doesn't have enough ATB). After a while it will start charging.
If Bahamut is not pressured anymore, cripple its wings with Thundara. Otherwise cast Thundaga on the main body. After it transforms you can parry in Prime Mode all its attacks (Galewind Slash, Whirlwind Slash, Soaring Slash). A few parries and Thundara/Thundaga will stagger.

9:35 Odin
Punisher Mode to parry Soaring Spear, then Prime Mode. If he does Charge instead: Prime Mode, dodge back to cancel animation, parry. Plasma Discharge and Sonic Boom (SM) whenever you can. Attack and parry, but be careful of Helmcleaver and Scintillating Spear.
If not dodged, these attacks put red/pink "handcuffs" and Odin will counter any ATB command with Reprise (for the next 10 seconds or until staggered), even if you perfect parry them. Usually he does them right after Sleipnir's Furor.
Keep attacking (short combos, be ready to parry) and cast Thundaga to stagger him. You should be able to kill him while staggered or shortly after.
If the fight drags on and he uses Temporal Imprisonment, use Cloud's limit to be immune.

11:13 Build