Incandelons are naturally quadrupedal, but can assume an anthro or even human form. What this looks like is up largely to interpretation, but should be recognizable as the same character.
In anthro form, the markings, mask, and tail/lantern should be pretty much the same. Though the body type may change, and some markings or features may be shifted around or removed if they don’t fit on the more humanoid proportions.
Human form is much more loose. Generally, the hair color will match their fur color in feral form.
Human form Incandelons may still have tails or mask faces, or other features like furry bodies or toeless feet. They can also be fully human. The mask and lantern do not need to be attached to the body, but must be present. The mask and lantern can even take the forms of other objects, like a button on a coat, or a staff. Incandelons are most vulnerable like this, because if they lose their mask or lantern, they will die.
In anthro form, the incandelon simply adjusts their anatomy to be bipedal. In human form, the incandelon actually gains an organic body complete with organs and a nervous system, and is able to eat or be affected by injuries, weather, and sickness. (This is optional and is mainly referring to the incandelons that shift to be FULLY human, not just humanoid)
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example of an Incandelon with a fully human alt form.