Board Thread:General Discussion/@comment-28972229-20170801223518/@comment-26812877-20170803152408

Sorry. My mistake. I thought you were referring to me.

http://tvtropes.org/pmwiki/pmwiki.php/Main/CharacterDepth

Here's a link to TvTropes providing the definition to Character Depth. Every trait that defines character depth is listed in the first paragraph. Yes, "backstory" is listed on there but right after that, it says "and/or". If a character doesn't have a backstory, then look at every other trait on the page that defines character depth and see if the character has those other traits. If they do, then they have proper depth to them as characters.