The Daitokujis are known for their Mechas, indeed B-ko designed most of them! All of B-ko's inventions were designed with one objective; to kill A-ko. Sadly, most of these inventions have at least one fatal flaw, which makes it easier for A-ko to dispatch them.
In the first movie B-ko was very prolific with her inventions, she introduced power armour, transforming dune buggies, gigantic robots with co-ordinated artificial intelligence, and last but not least, the infamous Akagiyama 23 bio-suit that although looks skimpy, was ironically the most powerful and successful thing she built! In fact, the Akagiyama 23 is the only invention of B-ko's that lasted throughout the series.
Over time, B-ko's mechas became more elaborate, in the sequels B-ko designed 2 multiple component transforming mechas. One was the size of a small city, and the other, although smaller, was powerful enough to destroy A-ko by virtue of it's physical appearance. (At least, that was B-ko's logic)
Hikaru's research & development consists mostly of stealing B-ko's ideas, he isn't even imaginative enough to modify the design a little! He just renames the mecha, and (Tadah!) instant product! Arguably the only design he ever came up with was the Cherry Blossom mk III (Marilyn), though whether or not that originally came off B-ko's drawing board is ambiguous.
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