Mortal Engines Fans (MEF) discussion

Shrike is arguably the most enduring character of the Mortal Engines series. However, many of his actions seem unexplained and erratic. Through the series, we find Shrike taking part in some of the most important parts of the series (no spoilers!) What makes characters like Shrike so intriguing, and why do we like him so much? What are his origins? What do you think makes this monster into a hero?

Shrike's origins are clearly explained in Fever Crumb and here is his picture, drawn by the author featuring Shrike and my 3 cats.
https://d.gr-assets.com/photos/131656...