As for starting a nuker in 9Dragons, for the maximum advantage, one should either:

1. Make a Brotherhood of Thieves Nuker: They have the extra 50 defense buff, which is very useful. However, their shield recast animation is very slow.

2. Make a Heavenly Demon Nuker: They recast shields very quickly, a great advantage in PvP.

3. Make a Shaolin Nuker: These are the best, probably, fast shield casting, and good clan buff.

4. Make a Wu-Tang Nuker: Same as HD, roughly, except without a good animation for the nukes.