Things like Medusa heads would be nice.
My biggest gripe with 3Dvania is aside from the 64 titles in some segments of the game, the other 2 titles did not have the balls to implement a necessity for air attacks. Since COD is a hack and slash with barely any platforming we can disregard it, but LOI's Belmont had a whip, and having no succinct jump+whip mechanic which was such an important part of 2dvania, just sucks anus.
And I have noticed the game has lots of skeletons and zombies
White Skeleton, Green Skeleton, Blood Skeleton, Gold Skeleton, all with the same unblockable attacks.. Seriously it's boring as bat shit. Even the bats' shit is less boring. At least COD was the first 3D game to implement Rippers/ Fleamen as well as Cockatrice and a few more random off-the-cuff enemies (like gaibon). At least in the Wyvern battle you could jump onto its back and it became a different mechanic altogether. At least in the N64 titles when you fight that Giant Bull after setting the TNT/breaking the magic seal if you're playing as Reinhardt it makes it easier to jump+whip. Same goes for the Vampires you fight along the way.
Sorry, rant over. LOI is just lacking some critical mechanics imo, even though the gameplay works. The atmosphere music etc is great also. LOI did have The Forgotten One, now that was a memorable battle imo.