There's no need to ask others. Your fursona is your creation and you know the best what you like and not. You can do whatever you want.

it can be anything, just no unusaul colors pink, blue, purple, greeen, ect...

Your fursona can be what you want. For example, mine has the same colour fur as my hair. Eyes as my eyes, and blue highlights like I plan on getting. but make it the way you want to.
Oposite Gender you can do. An example is if you are a girl you can make a Malesona also. but I suggest making your Fursona and Make the male/Femalesona after you decided on your Fursona.

it's your fursona so you can use any coulers mainly the ones you like best it's your fursona so it has to be something you like not us

You can do whatever you want with your fursona.