Answer:
Only two backbones and thousands of ribs.
I am never quite what I appear to be. Straight-forward I seem, but it's only skin deep. For mystery most often lies beneath my simple speech. Sharpen your wits, open your eyes, look beyond my exteriors, read me backwards, forwards, upside down. Think and answer the question...
You’ll have me at night and if you remove the first letter I denote the top, such as on a train
If you spot one of these eastern warriors, they're not doing their job right.
I'm tall in the morning and short in the noon. I disappear at night but I will be back soon.
I never sleep yet sometimes I weep. I can get angry or just be happy. Wherever you go, I will follow. No matter what you do, I will be there. I cannot die. What am I?