How did Malachi describe God and his role in creation?

Malachi described God as the father and creator of all.

Source: Malachi 2:10

In Numbers God commanded the blessing for his people. Did he refer to himself as male or female or neither?

He described himself as male referring to his face and his countenance. This blessing is still used today by many churches.

Source: Numbers 6:24-26

No he did not, all his appearances were in male form.

Source: Genesis 16:7-13, Genesis 18, Genesis 32:24-30, Numbers 22:31-35

God appearred to man in human form a few times in the Old Testament. Did he ever appear as female?

Jeremiah described the anger of God towards Israel. How did he describe it?

God described himself as a wronged husband. The nation of Israel was a treacherous wife.

Source: Jeremiah 31:32

How did Isiah describe the parental relationship between God and Israel?

Isiah described God as the father of his people.

Source: Isiah 64:8