How do you get ginny weasly in lego harry potter?

In LEGO Harry Potter: Years 1-4, you can unlock Ginny Weasley by completing the story mission in Year 5 titled "The Order of the Phoenix." After you progress through the story and reach the mission where you can play as Harry, you will eventually encounter Ginny. Once you complete the mission, she becomes a playable character in free play mode. You can then use her in subsequent levels and the open world.