I think the professional traders personal characteristics was self discipline, self-control/know how to control emotion. Those virtues I think is a sign of professional traders which traders supposed to be have it 
There are tons of the characteristics which will be deciding the profit level of one trader. I believe only the profits and the frequency of profit will be deciding a trader as a professional or not. I'm not seeing only very few characteristics will be helping traders to become as a professional traders because if it is not that much simpler one then we will be having more number of successful traders but actually trading is not working in that way.
Making profits from trading is a highly challenging job and every trader is working hard for their personal profits and in this process they are finding themselves as a professional traders.
The real professional trader need to do many homework, even i can't do it.
They need to build their portfolio, some got customer to funding them, they need to build other's portfolio also and report.
Know financial calender.
Prepare of the big mindset towards company or related industries, check their information, balance sheet etc.
Watch many charts in one monitor, charting etc.
Set their trading time
very high challenging, i try before...