Aron is mentioned the most in the book of Exodus.
Humans; they are the only animal mentioned in every book.
The book of Genesis says that the serpent was the most crafty of the animals. And Satan came in the form of the snake to tempt Eve.
Jesus is mentioned the most in the Gospels: Matthew, Mark, Luke, and John. Of the gospel books -- the name of Jesus is mentioned in the book of John more than another other book.
I
In the NIV bible it is mentioned 31 times throughout the book of proverbs. Most of them are in chapters 11, 12, and 13.
scarlet
Lord
dove
Euphrates, it is mentioned 21 times.
The book in the Bible with the most chapters is the Book of Psalms, which has 150 chapters.
There are only two (three if you're Catholic) angels mentioned by name in the Bible: Michael and Gabriel (the Book of Tobit adds Raphael, but most Protestant denominations consider that book apocryphal). But if your referring to the name of the category of angels that are closest to God in heaven, it is "Archangel".