Raijin (Final Fantasy VIII)

Raijin is a character from Final Fantasy VIII, and one of Seifer's sidekicks (the other being Fujin). He has dark skin, wears a purple vest, and says "ya know?" at the end of his sentences. He appears semi-frequently thoughout the game, three times as a boss battle (twice with Fujin, once alone).

Name Origin
Raijin is the Japanese thunder god, which fits, because Raijin uses thunder-based attacks, and any thunder attacks to him heal him.

In Chinese Buddhism, a legend states that Fujin and Raijin were both originally evil demons who opposed Buddha. They were captured in battle with Buddha's army of heaven, and have worked as gods since then.