Say you haven't used Skritter for a while and you have roughly 500 vocab items to review. But you miss most of the items shown to you as they appear. Do you have to go through all of the 500 vocab words before Skritter starts showing you the ones you missed?

The just-missed ones tend to reappear soon, I notice. Having to go through all 500 first would be bad.

btw, just wondering why are there three accounts with your mnemonics?

DobbsBob I can think of two possible reasons. But other reasons probably exists.

1. I may have duplicate accounts visible. This is due skritter having a glitch and deleting my mnemonics in the past. The skritter guys said they made backups for my account in case it happened again. It is also part of the reason I stopped studying for so long.

2. You are viewing an other account that has decided to copy and paste my mnemonics for their own use. Sometimes I would review a mnemonic and think of one I liked better and change it. People using my mnemonics probably didn't like it getting changed on them. So they just saved it as their own.

Do they all go by ddapore99? Could you give an example of a character or kanji you see this in?

Yeah reason 1 explains it. The others are Stub and Stub2.