Grand Army of the Republic - Alpha ARC Troopers

Mandalorian Warrior

Grand Army of the Republic - Alpha ARC Trooper

ARC Trooper Alpha-09 "Crane"

Alliance Special Forces - Commando Squad Leader

Imperial Special Forces Brigade - Scout Sniper

Mandalorian Warrior Munin Skirata

This character appeared just briefly in Karen Taraviss' Republic Commando books when he adopted the orphaned boy who became Kal Skirata as his own son in good Mandalorian Tradition.
The Basic figure is a Jodo Kast with a head from the parts bin and a Jango Fett gunbelt added.

Mandalorian Warriors

These are just simple head swaps, but effective in order to enhance the overall looks of the figures.