Clover

Professor Clover was a professor and scholar from the Tree of Knowledge in Ohara, he helped Nico Robin become an official archaeologist. However, he forbade her from studying Ohara's Poneglyph, not wanting her to fall prey to the World Government like her mother, Nico Olvia, did. Sadly, it was not to be as the World Government found out about Ohara's research and dispatched the CP9 to take care of them. Clover tried to persuade Robin to escape as the CP9 rounded the archaeologists up. The reason for this is that Clover spoke to the World Government regarding the scholar's findings in the Poneglyphs. He did not want Robin to know those results, for fear that she will also be targeted by the World Government.

Clover stated that before the World Government was formed, the Grand Line was ruled by an ancient kingdom. But they were wiped out by a group that would one day become the World Government. However before Clover could reveal the name, he was shot and mortally wounded. The Buster Call was then initiated and Navy ships began to assault Ohara. Clover, along with Olvia and the other scholars, stayed behind to save as many books as they can from the Tree of Knowledge for future generations. Afterwards, he and the scholars all stayed in the tree as it burned down around them, and as Ohara was destroyed.