When acting, the goal is to create a character that will captivate the audience, bringing them into the world. Staying in character is very important, but creating the character in which to stay is equally important. Here are some tips to create a very believable persona.
Instructions
1. Respect your colleagues. Don't try to steal the spotlight or make everything about yourself. Reactions are usually the most genuine forms of acting.
2. Go beyond your comfort zones and be embarrassing. Don't worry about looking cool. A character is different from a real life persona.
3. Use props correctly--don't use them for the sake of using them. If they can be worked into a scene, incorporating the scenery, great. If not, don't fake it.
4. Use the mise-en-scene and background. Don't deliver lines while standing still and then move around. Act just as you would in your own setting/house.
5. Separate your level of intelligence from that of the character. Tom Hanks knew a lot of stuff Forrest Gump didn't, but he had to really sell the viewers that he didn't know. This is tough, but incredibly important.
6. Have fun with the character, exploring new realms of performance possibilities. Usually those having the most fun will deliver the best performances.