Jack sometimes hated his curse. At least he considered his bunny form to be a curse. The truth is, he has no idea what it is, why he can shift into a white version of the Easter bunny and anything relating to it. He only knows, this form allows him to understand the Sandman and Santa's Yeti, and oh boy is he happy about this. His life would be very lonely without this.
The Guardian of Childhood, and another guardians assistant know about his secret, and Sandy explained to him what he is. He is a Pooka. Why? Not even Sandy knows this.
Why they know Jack's secret? Sandy saved his cotton tail. And he met the Yeti when trying to break into Santa's workshop. Especially one called Phil.
Jack never bothered telling and showing people his second form. Nor show them his precious pocket watch. This decision solidified when a bunch of summer spirits discovered his form. Like always, they attacked Jack, because summer sprites are everything, but peaceful. At least according to any winter spirit, that is.
Like a law of nature, a group of them attacked Jack, the only winter spirit known to do his job, that isn't the snow queen.
Jack, in his human form, wielded his conduit, a wooden shepherds staff, blocking hot attacks with his ice magic. Like any Wednesday. Normally he handed them just fine, being way too used to these confrontations, but that fateful day, he was overwhelmed.
The leader of the group, Blaze, got close to Jack after dodging ice shards after ice shards. They engaged in hand to hand combat.
Jack's human form is a disguise, a glamour he can apply. To hide his true looks, his Pooka form, he always keeps this glamour up. Hence why he sees it as his true and primary form, even though it isn't. To accomplish this, he avoids anything that could ruin his focus, which includes touch, hence hand to hand combat. This results in Jack lacking in this kind of combat, making him loose pretty much always.
Blaze burned him on his right arm, his glamour fell and his white fur was revealed to the summer spirits. The summers stared in surprise and shock.
"Uh... you... like the Easter Bunny...", muttered Blaze very confused. "I... woah."
Jack was in panic, he tried to hide this. In his panic, he did not notice another summer sprite sneaking up on him. He only noted her when he felt another burn.
His pained yell was heard by a small golden man. Sandy, a Guardian of Childhood and spirit of dreams. Sandy conjured a plane made from his dream sand and soared to where ever that yell came from.
He soon spotted multiple spirits in battle near a lake.
He recognized most of them as summer spirits, but one was odd. It looked like his team mate and friend Bunnymund, the Easter Spirit and Guardian of Hope. But this one was white as snow. This confused the oldest Guardian greatly. But no time to loose.
Getting closer he saw that the white Pooka was getting attacked and overwhelmed by the summers.
Close enough, the plane busted into gold sand, the sand attacking the summers, pulling them away from the Pooka.
The summers realized who he is and were in panic. They fled, leaving their victim to their own devices.
Jack watched this, but didn't really realize what had happened. He was too much in pain. His fur was charred on his back and arms. Especially on the spot Blaze touched. That one will guaranty leave a scar or something. Maybe his fur won't regrow there, leaving the spot blank and bold, always showing a scar. He then checked if he still had his watch. He can't explain why, but he knows he just can't allow to loose it.
Jack cooled down the spots with his eyes, before looking for his savior. Turning around he saw a short golden man.
"Hello... um... thanks. For the help.", spoke Jack. He isn't used to talk and still in pain. He then realized that the spirit in front of him is one of the Guardians he heard so much of. "You're Sandy, right? The mute guardian?"
Sandy nodded, before flashing his sand signs, even though he is sure the Pooka can't understand them.
"Woah, woah, slower.", interrupted him Jack, "I assume you want to know my name? The name's Jack Frost."
More signs, but this time slower, flashed over Sandy. Including a miniature variant of Jack and the summer sprites.
"Oh, yeah, the summers. That they attack me is normal, summer-winter rivalry and such. I normally handle them well, but Blaze got close to me. I am just not good in hand to hand combat.", replied Jack, seemingly deciphering the signs. "And about my look. I am aware I look like a white version of your friend, but I have no idea how and why."
Jack then turned into his human form. Hair as white as his fur, eyes still brilliant blue and only a bit shorter.
"I just know, I would prefer if you tell nobody about this, please.", pleaded Jack.
Sandy replied with thumbs up and a nod. He then guided some of his sand to Jack and used it to heal him. The sand vanished and Jack realized there is a hand-shaped mark on his arm. Blaze's hand print. Jack than shifted back into his bunny form. There where Blaze burned him was no fur, just a scar mark.
"Oh moonlight, that mark will stay, I guess.", he muttered. He then added, "Thank you, Sandy."
Sandy nodded again. He then spotted Jack's pocket watch. She was silver, had frost on it and a sign that looked like a stylized rabbit head. Jack noted that Sandy eyed it.
"Oh, the watch. I always had it on me, since I can remember. I don't know what it means, only that it feels important.", explained Jack, "It feels like a second conduit, like my staff. Just different, and blocked."
Since then, they met up semi-regularly and talked.
On one of their meetings, Sandy explained Jack that he is a Pooka, like Bunnymund. But how and why, Sandy can't explain. Sandy asked if Jack would want to contact Bunnymund, either in hopes of an answer, or just for company. He knows Bunnymund often complains about being the only Pooka. Jack just looked at his mark and declined.
This continued for a while, until Jack told Sandy about the Blizzard of '86...
Once again, Jack was battling against a bunch of summers. And a few spring spirits, lead by their leader Willow Fall.
"I just do my job!", yelled Jack.
"But it is Easter!", replied Willow, fake friendly, trying to hit him with her vine whips. Jack dodged her attacks.
"I know, Willow! But Mother Nature and Ana both told me-"
"It is Queen Anastasia to you!", interjected Blaze.
"Oh please, only you summers take the royal title crap seriously.", said Jack. "But really, I'm told to spread winter."
The summer and spring spirits didn't listen and continued to attack. One of them smacked his staff out of his hands. The staff fell to the ground, so did Jack. Upon hitting the ground, ice spread from the staff, freezing anything close-by. Jack also it the ground, upon impact releasing magic.
A blizzard appeared, overpowering the spring and summer spirits. They may be arrogant, but they know a blizzard by a winter seasonal isn't something to take with ease.
Jack stood up and searched for his conduit. He can't tame the blizzard without.
"You!", yelled a voice he knew too well.
He saw Bunnymund approaching. He is one of the Guardians of Childhood and the spirit of Easter. He pissed him off often, but he never saw the fellow Pooka as angry as today.
"I can explain!", said Jack.
"No you can't!", replied the angry rabbit, "A blizzard on Easter can't be!"
"It was an accident!"
Jack grabbed his staff and started to fly into the blizzard, starting to tame it. Bunnymund chased after him.
Jack was in panic. He flew deeper into the blizzard and shifted. He was hard to spot, giving him the chance to vanish.
Not only does he look like Bunny, he can make tunnels appear, but he rarely uses them, he prefers to fly. And he is hardly in his Pooka form, so there is that. Each travel method is locked to each form.
He jumped down the hole, leaving Bunnymund clueless to where he is, as well to what really happened...
Sandy sighed. He understands now why Jack keeps this a secret, he is scared of Bunny and doubts he would listen. Maybe Bunny knows what the watch means. The sign on it looks like a Pooka symbol. He can't loose the feeling it would be better if Jack reveals his true nature...