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I've seen different things in regards to a low charisma. There are definitely ways to play a low charisma character that adds personality to them and to your story, charisma is malleable as are people just have to play it in the right way.
For some it is lack of personality; A laconic, dull or shy person who makes little impact on the world around them. They might talk to you at a party and an hour later you couldn't remember their name. Which is what it sounds like your player is going for. A bland person with a lacking personality does work but the player themselves might find it boring after a while.
For some it is simply physical beauty; ugly scars, burn marks, deformities that despite whatever articulation they might have simply leave a person uneasy.
Another way is an off-putting personality or lacks in social recognition; Someone without personal space boundaries, creepy stalker types, overly bubbly over sharing types.