More difficult performances will, in turn, feel more natural. You'll ease into your new character as you complete simple tasks. This is easier to do if you get in character hours (or even days) before you need to - simply hang around the house or running errands in-character as your alter ego. Resist any urges to act like you normally do. If you flip-flop between your new identity and your old one, people will see you as a person in a costume, not as an entirely new person. Your alter ego will seem more "real" and authentic if you commit to your performance.
WHAT IS AN ALTER EGO SERIES
Your alter ego can be an anagram for your own name or some other word or phrase (as in the Harry Potter series of books, where the main villain uses his real name, Tom Marvolo Riddle, to spell the anagram "I am Lord Voldemort.") It can also make implicit reference to your real name (Jennifer Lopez, for instance, goes as J.
Think of names that fit your alter ego's purpose. Make a list of names, including even ideas that you think are silly or inappropriate - they may lead you towards a truly inspiring name. This is the most fun part of the entire process! A good, catchy name can take an alter ego from merely interesting to iconic.