Success at Protiviti rides on quite a few things. I would say communication is important. You have to ask a lot of questions and constantly adapt to feedback in order to perform your work properly. Be adaptable, be coachable, and and always be dedicated to being the best employee you can be. It's also important to get along with your coworkers. During an internship at Protiviti, there will be a lot of company events and happy hours. Take these opportunities to let loose, have fun, and create good relationships with your peers.
Everyone has their own definition of what it means to succeed, and expectations are different for everybody. Generally I would say have a good attitude, be willing to ask questions, and offer to help when you have a lighter workload. Go out of your way to educate yourself about topics relating to your projects, and get to know your co-workers.