Jesus was indeed made according to the seed of David (Romans 1:3). Did you know that the Bible says that Jehovah has a Maker (Isaiah 45:11)?
He is also a Person (Romans 8:26-27). He has a mind, and also makes intercession for us.
I agree with your second part, but as far as Isaiah 45, I believe God is referring to Israel, because Israel is referred in chapter 43:
I am the Lord , your Holy One, the creator of Israel, your King.
Isaiah 43:15 KJV
Isaiah 43:15 I am the LORD, your Holy One, the creator of Israel, your King. | King James Version (KJV) | Download The Bible App Now