In our lesson, we have seen:
Olivia: Grieving her dead brother and father, however wanting to show the world that no one can grief as her.
Viola: The intelligent pragmatic woman, who seeks solutions instead of lamenting over drams that happened to her.
Orsino: Blindly in love with Olivia, but we are not sure if he is in love with her or in love of how he is in love with her.
Malvolio: The puritan within in the play, talks in a disdainful way to everyone he things is under him, and seeks the fortunes of Lady Olivia.
Maria: The shrewd maid that will have a hand on the making of the downfall plan for Malvolio.
Feste: A wise fool who tells the turth about everyone without getting hurt at any time.
Sir Toby: The drunkard cousin to Olivia who does not care about anything in the world, or so he seems to be.
Sir Andrew: Toby’s friend, fool, idiot, and thinking of himself being a brave knight in a very Don Quiwote-ish way.
We have discussed the aspect of Comedy IN Seriousness, through several scenes
1- Confession of Olivia to Cesario
2-Malvolio with Yellow stockings presenting himself to his mistress.
3-The ridicule fight for love between Cesario and Andrew
These are only some examples; you have to read the play and elaborate more on your own.
We have spoken also about Disguise
Being a device, disguise is both a curse and a bliss, we saw that through some examples of the play.
A curse as Viola falls in love with the duke, Olivia falls in love with Viola, Sebastian fights with Andrew willing to kill him which make disguise dangerous.
A bliss as it helps to untangle all the problems in the play at the very end.
Again, you need to elaborate more on that and do some research.