在考研复试中，当被问到自己的性格时，可以使用以下词汇和表达来描述：
自信：
I am confident in my abilities and believe that I can handle the challenges ahead.
坚韧不拔：
I have a strong work ethic and am not easily discouraged by difficulties.
乐观积极：
I always try to maintain a positive outlook and look for ways to improve myself and my situation.
团队合作：
I am a team player and enjoy working with others to achieve common goals.
细心认真：
I pay close attention to details and strive for excellence in everything I do.
有责任心：
I take my responsibilities seriously and am committed to fulfilling my duties.
适应能力强：
I am adaptable to new environments and quickly learn new skills.
沟通能力：
I have good communication skills and can express my ideas clearly and effectively.
"Good morning, I am very glad to be here for this interview. My name is [Your Name], and I have just graduated from [Your University] with a major in [Your Major]. I would describe my personality as open-minded, diligent, and responsible. I have a strong work ethic and am always willing to put in extra effort to achieve my goals. I am also a team player who enjoys working with others to achieve common objectives. In addition to my academic pursuits, I have a wide range of interests, including basketball, reading, and especially in engineering fields such as software programming and website design. I have gained practical experience in these areas through various projects, including the development of two websites for my school and the China 2007 Doctor Forum. I believe these experiences have prepared me well for the challenges of graduate school and beyond."
在回答时，可以根据自己的实际情况和经历，选择最符合自己的性格特点进行描述，并尽量用具体的例子来支撑自己的表述。这样可以让考官更全面地了解你的个性和潜力。