Creating a Character

I am designing a character for my game, the cave.

http://thecave-progression.blogspot.com/

"kelly" (to the left), is not a main character but she will appear at some stages throughout the game.
Already i have come up with barriers with the design.
She is not a heroine type like lara croft or Nintendo's Perfect Dark; Konoko. But she will appear by your side in battle.

unlike lara, i have created Kelly as average as i can, i havn't made her ultra slim, or deliberately made her as a "sex sells" character.
She works as a sales assistant in the local garage of the town, and she is the main characters living partner.
With the male and female roles in the game, i am not creating anyone that posseses typical character traits, like; Big boobs, large muscles, thin slender bodies, etc.
I am trying to aim for a natural look.
Weather this is the right approach to take, for example many games sell well because the characters have a sertain target demographic, like Lara for example.