Lolz is this becoming a joke thread?
@on a more serious note
Personally, I'd suggest the following as a requirement:
-crabsticks (you always need crab/kani period)
-rice (obviously; if you can go for authentic japanese variety of rice, then go for it)
-Seaweed (seriously, do not skimp/remove this out)
Optional but recommended:
-Fruits (mango would be the best IMHO)
-Mayonnaise
-Tamago (or those little egg thingies)
-Shrimp or prawns
Well there are apparently a lot more things that can be suggested or recommended but that's all I can think of at the moment. Aside from the ones mentioned above, try and test for other items that may blend well with the sushi that you plan to make.
Hope that helps