Male bettas, imo, do have personality. I have 6 of them currently, and they are all very active and friendly. I keep them in 1.5 gallon tanks with a small filter and heater. They are very happy in there. I tried to move them to 5 gallons, but they weren't happy in the 5 gallon tanks. These 1.5 gallon tanks are hard to cycle, however and i find putting a small sponge filter in it works better.
As for females, I have found many beautifully colored females. There fins are, however, much smaller.
As for females, I have found many beautifully colored females. There fins are, however, much smaller.