Gaku Ki was a large man with great presence. He had a very long beard and wore a general's armor.
Not much is known about Gaku Ki's personality as of yet but from what has been shown he has a calm personality as he had no issue with Geki Shin trying to steal his way of warfare.
Around forty years before the story takes place, Yan was nearly wiped out by the super state of Qi. Gaku Ki was able to turn the tide completely and push the Qi forces all the way back.
He led the first official coalition army against the super state of Qi, destroying most of it.
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His battle strategy was stated to be using the advantage of the opponent to turn the tide against them shown by his victory against the former superstate of Qi. From what is seen in flashbacks from Geki Shin, his method was to use the understanding gained in each clash and by working backwards gain a greater understanding of the opponent and their strategy, in order to reverse the tide.