Now we've finally reached the 7th member of the Chaos Seven, and despite the fact there is only the mane six, it often feels like that Twilight Sparkle's Assistant, Spike, was the hidden seventh member. After all, he is quite diligent and prepared to help his friends when needed.

Now in the world of chaos in which Twilight still hatched them as an egg, possibly with chaos magic, but it resulted this dragon. Of course, still named Spike, and at times I feel like teens/adult-dragons are somewhat immune to magic, at least their scales are immune to most magic except dragon magic. Due to this natural resistance, chaos magic barely affected him in most ways except for his growth into this state (hence why he is colored in the similar art-colored style of the show).

As for why Spike barely changed except being an adult anthro male with breasts, or they're female version named Barb, or perhaps they're futa, this is a clean one so no one knows Spike's correct gender but could only assume by appearance.

But one day while preparing to help his friends when needed, he would find two weapons in the old ruins that belonged to the ancient mythical royal alicorn sisters that had vanished a thousand-years-ago. The weapons being; the Sunlight Greatsword and the Darkmoon Greatsword. Being strong enough to wield both, he would train himself to wield them while also continued to assist Twilight and the others with what they needed. And eventually Spike becomes a great warrior, the wielder of the sun and the moon.

Spike the Dragon is a Diligent Chaos Warrior.

Spike is a character from the old cartoon show: My Little Pony Friendship is Magic
This character/artwork design of a Dragon Warrior , the anthropomorphic Diligent Chaos wielder, was made by me:  Josephiroth