Extremly proud with a stubborness that rivals a moose, Jaku makes sure everyone in the room knows he's the boss. With his sister always backing him up, he has come to fear nothing knowing she will be there to cover his weak spots.

He absolutely despises Runigir as he believes he's a stain and brings down his family name that once was so looked up to. Unlike his sister, he remained pretty much the same as he grew older and joined the ranks of soldier. Unused to fighting without his dear sibling to back him up, he mistakenly leaves his back open for attack.