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View: https://www.youtube.com/watch?v=QIwJfVwqOcQ
Itou's fight in Kenzan. To be fair, its both the theme AND the QTE that really makes this fight further hype. But the theme definitely does a lot of heavy lifting.
View: https://www.youtube.com/watch?v=3AKRhnrpWKg
Ishin's final boss theme. Play the original (not the remake) for the better version of the final boss gamepaly. This is ace from beginning to end. Amazing build up, syncs with the intro perfectly. Also the way the theme changes for each phase... amazing.
View: https://www.youtube.com/watch?v=VqT06G7cICM
Kaito Files gets a different kind of final boss, reflected by its more sombre tone. This fight isnt some criminal or evil doer, its just two dudes fighting honerably. Its in such stark contrast to the entire rest of the series I cant help not mention it every chance I get. Its such a wonderful theme as well. Definitely a top tier RGGS boss moment.
View: https://www.youtube.com/watch?v=cjv1AN6XldI
Gaiden's final boss theme. This one is kinda personal, because I HATED how 6 ends with Iwami as the final fight. Just a pure shit head that destroys the ending for me, such a lame SOB as Kiryu's "final" fight that it'd stuck with me for a good 7 odd years lol. But this here was basically RGGS chance to fix that wrong, and Gaiden gets a superior final fight, even if it keys off of 5 so darn hard. I love the end part of the song which changes pace to fit with the slower "end" of the fight. 10/10, and thankfully 8 didnt fuck things up with Kiryu's ending either, Kiryu redeemed!)