You are not entitled to choose what information you want to share, other than the info you give besides the required info, when selling a character, read Character Bazaar rules.
You cannot give a price on a character when you only know 1-2 pieces of info about it. The first few millions of skill points (upto about 5m) does not fetch much of a price as anyone can easily achieve this. As the name of the character is the main selling point it’s quite important that potential buyers know what it is, would you buy something that you know nothing about?, I don’t think you would, neither would I, any potential buyer is left with only questions: “What have it been use for that warrants not disclosing it’s name?” and possibly “does it even exist at all?”