Shared in this post will be the heavy missile and agile missile. Although you may not see these for long on the screen, it's just as important to give them their own shape and style. Below is the concept art and final models.

The heavy missile is slow and heavily armored but deals a lot of damage once it hits it's target.  A solid shape is needed along with metal textures to indicate the protection it has. A hazard stripe was added to further indicate the impact is going to be bad for your opponent. 

 Unlike the heave missile, the agile missile is fast. A sleek design with sharp angles was focused on.