You probably can, but the key word here is "change". I believe you can somehow "change" personality. You can't however "add" new personality. Changing person

You probably can, but the key word here is "change". I believe you can somehow "change" personality. You can't however "add" new personality. Changing personality requires sacrifice, abandoning the old self and many things that you currently love. And that is truly hard. At least that's what i believe.