To prepare for that, the last couple of years, we've practiced playing Matsuri Taiko (Festival drums), a well-known taiko song that a lot of taiko groups in NA play a version of. What makes this different is that we play with Japanese masks. There are demons, old men, shy women, foxes, monkeys, etc. The whole idea is to embody a different character and lose inhibition.
The drill this time is about emoting or assuming a role that you may not normally portray while playing. It doesn't matter what ji you play to; it's about acting the part. If you don't have someone/something to hold a ji for you, you can still try it.
First thing you have to do is not think "I look stupid." You have to give into the role, have fun with it. Second, don't worry about how immediately useful these roles are, because you're developing your acting "muscles". Think about your physical muscles; you get stronger working a group of muscles than focusing on any single one, right? Same concept for emoting.
Try these to start:
- Joyful
- Furious (don't kill the drum!)
- Shy
These are more difficult:
- Very old/Very young
- Super-confident
- Overly dramatic
- Mischievous
Finally, some really challenging ones:
- Playing as a person you know (taiko idol, fellow performer)
- Playing as an animal (how would an elephant play taiko?)
Ultimately, if you want to look confident, you have to act confident. It sounds a lot harder than it is, so go try it!