In act 2 scene 5 Shakespeare presents Malvolio's character as very gullible this is because, Malvolio starts to read the letter (from lines 80 onwards) and even though he knows that Olivia has not fallen for him he believes it, but only because he wants to, this also shows that he is quite stuck up and arrogant; he thinks very highly of himself.

He is very independent as he has no interaction with other characters; accept for Olivia, but that is as a servant and not a friend. According to his language he seems very high up in social hierarchy, even though he's just a servant.

At the same time as being alone, he is also very confident, which has built his character up extremely well. My evidence for this is on lines 15 onwards in act 3 scene 4, as he flashes off his yellow stockings and cross gartering, at the same time...