Yep, definitely a cockerel, Parentwarrior2. D'Uccle pullets have a tiny pale comb. You can see photos of my porcelain d'Uccle, Chickpea, that also turned out to be male.
My Chickpea was such a sweetie for about 9-10 months, then his hormones went into overdrive and he became hen crazy, and that made him start attacking me, so he stopped being sweet with me. I had to train him not to attack. At the time I only had standard size hens, which were too big for him, but he kept trying to mate with then. My Polish rooster, Bowie, tolerates him, even allowed him to try to mount hens right after he (Bowie) had mated with them. Unfortunately, after a few months of that, Bowie got fed up and all of a sudden started to attack Chickpea, and afterwards even some of the hens pecked him to drive him away from them. That let to Chickpea becoming depressed and stopped eating. I had to bring him into my apartment to try to nurse him and encourage him eat, but sadly he ended up passing away, despite all my efforts to save him. It's as if he had given up on life after getting ousted from the family he had grown up with.
Anyway, I hope your little d'Uccle cockerel stays sweet. Since you only have 1 other chicken, a large hen, there should be no problem. It'll be hilarious watching him trying to mate with the Jersey Giant.