Dorothy Unsworth

Dorothy is the captain of Clover Kingdom's Coral Peacock squad of the Magic Knights.

Though she is seen sleeping for a reasonable chunk of Black Clover, it is revealed that she has a very extroverted and bubbly personality. On top of this, she uses Dream Magic to trap her foes in "Glamour World": a place where anything Dorothy thinks of becomes a reality.
(Source: Black Clover Wiki)