These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Anti-Climax Boss: In both fights against Binbou-gami (who is a Fiend, a race which is usually made up of impossibly hard bonus bosses), he is frail to fire; Pyro Blade/Pyro Killer allows you to keep him stun locked for the entire boss fight. He even makes his weakness blatant in the dialog! (Warm you up? Alright.)
Lucifer. He attacks with a dead-set pattern: Maragidyne, Evil Gleam, King's Yell, Roughhouse, Roughhouse, with one or two variations at random times to try to throw you off. If you know this pattern, he'll have a VERY hard time damaging you, and if you buff your Attack and Magic with Kaja spells and wail on his angel form when it shows up, the match will be over in very short order.
Continuity Lock-Out: Inverted. You would be forgiven for thinking that there wasn't a game before this one if you hadn't played it, since this one hits you with Bag of Spilling and there are virtually no direct references to the last game, not even the part where there was a giant robot frying the city. Note that if you do use the Old Save Bonus, the characters do reference the previous adventure.
Lampshaded in conversation with Raiho. Should you answer "No" when he ask if Raidou remember him, he will conclude that you must be a new player and miss the first game.
Crowning Moment of Awesome: At the end of chapter 6 there is a huge one for Raidou and Taotie, because they work together to eat the space between the Gate in the capital and the pojitrawn in the village they are in.