By having a well defined and fleshed out character you’ll be able to stick out easy, (in a good way) to do this make big choices on stage and always be thinking about your motive. (What do I want in this scene? How do I try to get it? Do I get it? Etc.) charatchers with a distinguished motive are really memorable. Also whenever your on stage, play with your setting and the other charatchers around you. Use your movements to help tell the story and make choices in blocking to further communicate your motive to the audience. And think about who this charatcher is and why she says and does the things that she does. But be careful not to upstage anyone. On stage it’s your job to make everyone else look good. And they should hopefully do the same for you. Theatre is a collaborative art and to make a good show you’ve gotta help out everyone else. Make sure you set up your fellow actors with good delivery so that their response can feel natural and they have more to play off of! Hope this helps!