Olivia is characterised in this scene as fickle. This is shown through her thoughts; previously, she had said that she will not stop grieving for her brother but now, her soliloquy shows that she is already fawning over a new guy.
Methinks I feel this youth's perfections, with an invisible and subtle seath to creep in at mine eyes. Well, let it be. (1.5.l.276-279)
Sir Toby is characterised in this scene as rude. This is shown through his effects on other; Maria, Malvolio, and Olivia are all annoyed by his behaviour, and they show it through the following speech bubbles:
We did keep time, sir, in our catches. Sneck up! (2.3.l.84)
My lady bade me tell you that, though she harbours you as her kinsman, she's nothing allied to your disorders. If you can separate yourself and your misdemeanours, you are welcome to the house; if not, ... she is very willing to bid you farewell. (2.3.l.85-90)
My masters, are you mad, or what are you? Have you no wit, manners, nor honesty, but to gabble like tinkers at this time of night? (2.3.l.78-83)
For the love o' God, peace! (2.3.l.77)
Duke is characterised in this scene as determined. This is shown through his speech; he is ordering Viola to talk to Olivia and get her to return his affection and when Viola explains that Olivia might not see him, the Duke tells him to do whatever it takes to see results.
Be clamorous, and leap all civil bounds, rather than make unprofited return. (1.4.l.21-22)
Viola is characterised in this scene as bold. This is shown through her thoughts; when she finds the ring that Olivia left for her, she immediately deduces that Olivia did it so that she would come back and see her, as shown here:
I left no ring with her; what means this lady? Fortune forbid my outside have not charmed her! She made good view of me; indeed so much that sure methought her eyes had lost her tongue, for she did speak in starts distractedly. She loves me, sure... (2.2.l.14-19)
Feste is characterised in this scene as bold. This is shown through his speech; when Olivia gets fed up with his attitude, the following exchange shows his confidence in handling her anger and getting out of the situation.
Take the fool away. (1.5.l.33)
Do you not hear, fellows?ˇTake away the lady. (1.5.l.34)
Maria is characterised in this scene as conniving. This is shown through her actions; Maria is making a detailed plan about how she is going to prank Malvolio and she explains this prank to Sir Toby and Sir Andrew.
I will drop in his way some obscure epistles of love; wherein, by the colour of his beard, the shape of his leg...he shall find himself most feelingly personated. I can write very like my lady your niece; on a forgotten matter we can hardly make distinction of our hands. (2.3.l.141-146)