Yes, the hexagonal cross-section has often been cited as a trademark of Bugis blades. I would say it applies to many Malay keris blades of Bugis influence too.
In the world of Malay kerises, you have the Bugis-influenced blades, like the sepokal blades, and the wavy ones with kembang kacang and greneng.
You'd also have the pandai saras group of blades with diamond cross sections, as well as the carita and the melela.
There's also the panjang group of blades, including the bahari and anak alang.
Also, there are some very simple kerises with austere features, like a plain kembang kacang, jalen, gandik, ganja, and effectively a flat blade.
And then finally, you have the keris bethok (the short and broad leaf-shaped blades, like keris budi). (I don't have a pic)
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