Mix, Mingle
You put a lid on your father. But, he won't taste good alone, so you mix in some other ingredients. They mingle inside the pot with him.
This may seem traumatic, but actually your father is surprisingly into it. Imagine him mixed in with all kinds of other things. It's important to note that this kanji is about things being mixed in, not so much about the action of mixing. That's another kanji.
こう
まじ, ま, か
None
With a mix of your father and other ingredients mingling in your cooking pot, you lift up the lid... your father pops up. Your father is こういち. He stares back at you with a big smile.
"I love mixing in with potatoes and tomatoes," your father こういち states. "Turn up that temperature. I like to mingle with a bit more tingle."