Characters are what differentiate a scene from two assholes talking on stage. If you really want to learn characters you should take an acting course from a qualified acting coach. It will do worlds of good for your improv. The following improv structures can help with developing characters.
- Alliteration Prop
- Animal Characters
- Capturing the Whatsit
- Character Circle
- Corridors
- Elevator
- Emotional Transfer
- Exaggeration Circle
- Gibberish
- Gibberish-Switch
- Hello
- Help Desk
- Leading
- Park Bench
- Pass Catch
- Pass the Peep
- Puking Dinosaur
- Three Noses
- TRIANGLE
- Trifecta-Ties