Well, MMBN has dummied-out chips, I know that...
Like "Gregar", "Django", "HackJack" (EX/SP), "Otenko" and "GunDelEX"... that's in 6.
I also like MMBN4's last dungeon's theme. Pity it was contaminated with bad bugs, though...
Wonder what the fan-made MMBN7 I've heard of is like?
But a MegaMan is always a MegaMan...
The MegaMan Star Force games also had content that got removed as well. The Lunar Knight crossover was removed from non-Japanese versions of the game as was Wave Command in MMSF2 and Noise Mod Gear in MMSF3. So yeah, because I can't access Tribe King, it makes MMSF2s' bonus dungeon harder than it needed to be (and it's hell).
But hey, Libra Scale's stage theme is great and Meteor Server's theme is also wonderful.