AN: This is an idea had for one of those 'everyone in the world has 'The System' stories. Undecided on how fantasy vs how modern a full story would be but the idea for how the system, skills, and such works is set.

Hero of All Trades (First Look)

-Izuku-

Walking up to Aldera's skill scroll vendor, Izuku started flipping through what was available for that day.

"Hurry up brat." The staff member working the vendor stall wrinkled their nose upon seeing him, "You're holding up the line for people who can actually use their skills."

"I can use skills." Izuku gave them an irritated look but did start flipping through what was available faster.

"Suuuuuure, that's why you keep coming back week after week and buy up more skills than you could ever keep?" the staff member snorted, "Maybe you're not Jack at all, maybe your Unique just makes it so you can't do any skills."

Angrily slamming payment onto the counter, Izuku shoved the scroll he wanted into his pocket and stalked off to class. He'd study it later when he wasn't pissed off. The Guild Academy Aldera, a precursor to people joining proper guilds whether that's for adventuring, merchant work, crafting, or anything else imaginable.

He fucking hated this place.

Aldera had always been one to favor adventurer's with powerful unique skills over everyone else and with a favored top there always had to be a 'low tier scum' they looked down on which was, unfortunately, him.

He was a 'Jack', a Jack of All Trades class was seen as horrendous luck to get as one's starting Job. On paper it sounded good with it being able to learn skills from all categories but there were two major reasons everyone looked down on them. The first was that their stat spreads were often…chaotic at best, with no real focus on traits the stats went where they went which often could result in skills being trained no longer being viable. The second was that the Jack of All Trades job didn't have any job specific skills, whether ultimate or not.

Sorcerers could alter their spells function.

Wizards could recover their mana pool easier.

Fighters had ways to get boosts of adrenaline on command.

And more, there were even the ultimate skills for the different classes that only the best of those fields could get. But Jack of All Trades didn't have anything unique to it's job to learn, even if some people with the job insisted there had to be a way to find such things.

It was the reason that most with that job bought a job change scroll as soon as they could, even if in doing so they risked getting a job with a lower growth rate or power cap.

There had originally been around twenty Jacks in his generation at Aldera, but he was the only one who hadn't changed. And he didn't plan to.

"Oi! Deku!" his thoughts at his desk were interrupted by the loud voice of the School's 'pride' Bakugo. The staff at Aldera considered Bakugo 'born blessed' given he had been born with an Advanced Job of Arcane Warrior giving him access to a list of magical and martial skills, plus his unique skill was explosive magic so he always had a powerful backup that wouldn't degrade.

"What is it Bakugo?" Izuku sighed as he looked up at the person who had been his childhood friend but that ship had sailed a long time ago.

"I heard you were buying more skills today. The hell is wrong with you dumbass?" Bakugo barked, "You've bought dozens of skills and there's no way your useless ass has maxed out a damn thing!"

Yes, maxing out skills. Skills were powerful abilities and just using them would boost their experience thresholds. But the catch was that, apart from Unique skills, if a skill went unused for too long then it would eventually start to degrade and if it degraded too much then it would vanish. It was only by maxing out a skill did it 'lock' and become safe from that fate.

"That's none of your concern Bakugo." Izuku pulled out his papers and pencil, using a telekinesis skill to control the pencil and write his notes.

"Hmph," Bakugo scoffed as he saw the somewhat unsteady pencil "slow rate bastard." Before the blond bomber pulled out their own materials and also used telekinesis, their pencil moving with significantly more smoothness. All throughout the lesson, Izuku kept up the Telekinesis while also controlling other materials in his desk to work on his 'lateral thinking' skill.

As soon as the day was over, Izuku slipped out with 'Stealth' and made his way to Aldera's Dungeon. Nobody could follow him in if he did a solo run which provided a safe space to absorb his new skill scroll.

New skill unlocked. 'Skill efficiency' added to spell list.

Izuku grinned at the notification. Skill efficiency was a skill that sounded amazing on paper but it was one that people considered 'bugged'. Skill efficiency lowered the mana cost for all skills the user possessed but the skill functioned like a passive skill while needing experience like an active. Nobody had ever found a way to level it up so it had just become an expensive skill scroll that only the richest adventurers could use. They'd regularly buy them up in bulk to relearn the skill whenever it degraded out of their skill list.

He wasn't normal though.

Izuku Midoriya

Class: Jack of All Trades

Unique Skill: Omni-Jack. Category- Passive. Omni-Jack prevents all skill degradation. Omni-Jack divides experience gained between all Skills. Omni-Jack divides stat points gained via level up evenly.

His skills grew slowly since experience for any was divided among all his skills but it meant that he was constantly leveling up everything. Cooking dinner? It leveled up everything. Training in a dungeon? It leveled up anything. Writing his notes? Multi-tasking? Using spells? He was getting as wide a variety of skills as he could so he'd almost always be gaining experience. And with the stat function of Omni-Jack he didn't have to worry about the other risk for Jack of All Trades classes.

Upon every person leveling up their job, they would gain six stat points that would divide themselves among the six stat categories. It was randomized to a degree but every class except Jack of All trades had some stats that were 'favored' and more likely to get a bigger number of the six. Izuku's were divided evenly so each stat went up by one every time. He'd never have any truly absurd stats like some classes did but he wouldn't have any glaring weaknesses.

Cracking his neck, Izuku drew his short sword and dove into the dungeon proper. He had to train, and he would be the world's first Jack of All Trades Adventurer!