The reason why the onion knight didn't appear when Dark Soul 3 hit the Giant King is that if you kill Aldritz before hitting the Giant King, the onion won't appear. The solution steps are as follows:

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2. Then, in the capital of sin, don't walk in the direction of boss from the ladder next to the bonfire, go down to the building, and then go down from a place with a gap next to it. Explore first. The magician's roof kills the magician first, and you will find a window without railings opposite the magician's roof. Jump over and go ahead, and you'll find Brother Onion. Open the door with the key and you will find the onion knight. I will give you a wedge-shaped stone plate after the talk.

3. Go to fight the giant Tamaki at this time, and the onion knight will accompany you. Onion knight is fragile and easy to be killed by jade wood. In fact, it doesn't matter that the onion knight was killed by Yumu at this time.