You are not required to keep him, you know. Do you want your chickens to be pet-friendly to you? If so, lose the rooster. Do you have small children that live there, or visit? If so, lose the rooster.
Roosters can be kind of a crap shoot. You can raise five roosters in exactly the same way, and get five different results. I prefer not to handle, hand feed, baby or make pets out of them. I'd rather (as soon as I figure out who is a rooster) distance from them, teach them to respect me and my space, and keep his distance. Since I have been raising them this way, I have not had a problem rooster. From the threads I see on here about how roosters suddenly turn mean, they are usually the ones that are handled from the time they're chicks.
The ONLY reason a person NEEDS a rooster is to fertilize eggs. They can help keep watch and alert for predators, but a dominant hen can do that. Hens don't need roosters to show them where food is or where to lay their eggs. They do that just fine on their own.
You are the only one who can decide what to do with your surprise rooster. Keep him or not, it's your decision, and there is no wrong answer to this.