[@IrishAngelQueen]
[quote=The Rules]Unlike gods, demigods are purely physical beings, although as their level and power increases, it may result in a change to their form[/quote]
Demigods cannot, by default, change their form to whatever they wish at will. A small number of predetermined forms is acceptable (for example, Lifprasil/Vesamera, or Athanasios' human, stag and human-stag forms), although shapechanging to arbitrary forms requires some specific magic or Portfolio.

[@Cyclone] Do Zephyrion's wiki page.