What sex and how old will the chicken be when you butcher it? Is it dual purpose, Cornish X, Ranger type, or something else?
My dual purpose cockerels that I butcher between 16 weeks to 23 weeks have very little fat on them. I feed them a fairly low-protein feed along with the rest of the flock and they forage a lot. Old roosters don't have much fat on them either, not enough to make it worth taking off. If you feed them differently or they are a "meat breed" they may have more fat. I don't raise those.
I tend to butcher my pullets at about 8 months, after they lay a bit so I can decide which I want to keep. Those pullets and older hens have a lot of fat. Most of it is in the pelvis area in what they call a fat pad, you wonder how they squeeze an egg through that to lay it, but they do. They also have a lot of fat scattered on the rest of their body, on the organs and in with the meat. They put on all this excess fat so they have something to live on when they go broody so they don't have to leave the nest much to find food. Older hens have a lot of excess fat too, not just the pullets. I do remove that fat. It is a lot.
I don't roast mine but usually bake the cockerels and pullets. I cook the older hens and roosters in the crock pot. I use parts from all of them plus the cooked bones to make broth.
Once cockerels hit puberty and the hormones start flowing the meat gains flavor and texture. Pullets also gain texture and flavor as they age but not nearly as much as the boys. As mentioned above, some of us like that flavor, but some don't.
When you roast a turkey many recipes call for adding butter under the skin and to baste them in the droppings as they cook. This adds flavor and helps keep the meat more moist. If you remove the fat before roasting are you going to replace it with butter or some other fat?
Some people save the excess fat and process it to make schmaltz. I don't know if you are familiar with that, it's pretty common in certain cuisines. I doubt you will get enough fat from one bird to make it worthwhile making, but not all people consider chicken fat bad.