Really, all you need is a SS of the details sheet to copy a character. It contains all the gear and all the colors.
For the tower, HP Drain is a must. Venom Fang is almost equally important. There are other skills that might be usefull, but I recommend focusing on actual stats after that. The tower starts easy and gets rediculously hard. Also, there's decent mode, a survival mode with two characters vs 40 floors. For that mode, you may wish to build a character with Nullify Ring Out A to use near the edge of the ring, as I've lost far more characters in decent mode by ring out than by death.