Wren

So my main character is a kid genius. She has a mental condition obtained through a long series of events that enables her to remember everything (it's a lot more complicated than that, but I'm trying to be short).

I want her to have two sisters with the same condition, but would it be corny for them to be triplets that didn't know about each other? The sisters of my main character would at first be side characters, and then become more important once it's revealed that they are sisters of my main character.

Just a note: this is not the main point of the story. There is an actual adventure, and the triplets don't need to "work together to save the universe because it is the only way".

I'm writing a story about a ring of thieves, and I need some good code names (4)

If you want personalities to help you:

The first character is controlling and arrogant.

The second character is sort of dumb, he's mostly there for comic relief.

The third character is a computer nerd and sort of shy.

The fourth character is really tough and mean.

None of the above are girls, I already have all my girl code names. Also, please keep them simple, I need my dumb character to be able to comprehend them.