The pipe organ arrangement of Severe Blow goes so unreasonably hard for an anime about a guy larping as a shadow overlord. The Eminence in Shadow OST leans fully into Cid Kagenou's delusion with music that treats every scene like a gothic cathedral showdown.
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Grandiose Plan layers orchestral tension over choral stabs like something out of a Castlevania final boss room. Then they actually drop a Beethoven Moonlight Sonata arrangement on the pipe organ for season two and it somehow fits perfectly.
Into Madness lives up to its name with frantic strings. The whole score commits to the bit harder than Cid himself does. If you love overpowered protagonist energy set to dramatic classical arrangements, start here.