If the avatar is a representation of a biont or other physical sophont, it may or may not resemble the physical form of that sophont. There is an ancient tradition where modosophonts choose an avatar which is physically quite dissimilar to eir normal self; ey might choose to be a different species, sex or appearance while interacting in virtual reality. Other sophonts deliberately choose avatars which closely resemble their physical selves.
Virtual entities who do not have physical bodes of course may choose any shape they wish; but many prefer to adopt a small range of distinctive easily recognised avatars so that other virtuals will recognise them easily.
Avatar (Archai) - Text by M. Alan Kazlev A lower toposophic representation or entity through which a transapient or archai can interact in a particular environment or situation of a level one or more toposophic levels below. An Avatar may be a non-sentient icon, a bot, a sentient simulcrum or remote, a fully individual being, or anything in between.