I normally don't get into full detail seeing as the actual space for the bio is so small. Normally if the character has a preset then the link to the preset would be in there along with basic information like Name, Gender, Species, Age, etc. all the good things you need to know in order to roleplay with that character. The full bios of most of my characters are posted onto the site for the roleplay/group they belong to or they are written down into my computer files.