Kut-Ku is really easy.
Use sonic bombs (Gunpowder + Screamer) to daze it, as well as Flash Bombs.
When he starts breathing a little fire with every breath,(rage mode, it makes him stronger and faster) just avoid him.
Eventually the smoke and flames will go away and he will calm down.
Hit his head as mush as you can, and avoid being directly in frint of him at all times. Stay to the side as much as you can, since he is prompt to suddenly run across the field.
When he scratches the ground and kind of roars a little, use that pause in attacks to hit him on the head as many times as possible.
For anyone who doesn't know, I used to be Tree Afro.
You will come to understand fear as I have...
If you were me, you'd want to be you again...