Sir Toby

• Pourquoi, my dear knight? 


  (1.3.)

  Play on the term of address, as Andrew is far from a manly or knight-like figure
• I could marry this wench for this device


  (2.5.)

  Admires Maria.

  Foreshadows their love.
• for I am now in so far offence with my niece / cannot pursue 


  (4.2.)

  Toby wants to end the gulling - fear that Olivia will kick him out or be even madder.