You cannot play more than one character on a weekend (unless your character dies permanently and you start a new one). Otherwise, it would be too confusing to other players. Is this really your character in another guise, they will ask, or is it actually a new character as you say?
If you do create a second character, please have that character be as different from your original character as possible: your new character should have a different adventuring party, different costumes, and hopefully be of a different race and class as well.
Multiple characters belonging to the same player may never directly interact in any way. You cannot have one character sell, donate, or will items to your other character; nor can you use an intermediary to do this for you by giving them your possessions only to have them give them to your new character.