6. Mercedes Jones (Glee)
Arguably one of the most under-utilised characters in Glee's rocky history, Amber Riley's Mercedes Jones really didn't get a huge or even reasonably big role in the show, something that seems particularly unfair as she possesses one of the show's biggest personalities and strongest voices. Storylines were half-heartedly attempted or aborted all together and for an entire season (season two) she was given lip service and supported other characters' arcs rather than her own. As a result, Mercedes doesn't have a huge fanbase following or even a significant role on the show now and while she's often praised for her admittedly impressive vocal ability, Mercedes doesn't garner half the attention or storyline focus that her contemporaties in the glee club get and isn't exactly the first name on everyone's lips when Glee is mentioned, which is pretty unfair given her strong performances, her dediction to the cluba and being an all-round strong performer. Sigh...