What would be the Transfer Function of this Block Diagram?
I find it useful to work backwards from the system output signal to a convenient summing junction output, and then equate this output to the summing junction's inputs.

Thus, the output from the 2nd SJ is \$\large\frac{\theta}{I(s)G(s)}\$

The inputs to that SJ sum to: \$ M_P-\theta \:D(s)-\large\frac{\theta}{I(s)}K_T\$

Equating these two expressions gives: $$\frac{\theta}{M_P}=\frac{I(s)G(s)}{1+K_T G(s)+D(s)I(s)G(s)}$$