Furor Mecanica

Izuku towers over Bakugo as they prepare for the 50 meter sprint. Standing three meters tall and made of white metal with green accents, Izuku prepares his digitigrade legs for a quick charge.

As the starting gun is fired Izuku launches forward with a shout and arrives at the finish before Bakugo can even reach the halfway point.

"You move really fast for your size." Ochaka says as he returns to the crowd.

"Indeed, as a sentinel I charge into trouble with no hesitation." Izuku explains.

"Sentinel?" Ochako asks.

"That is the form that I am taking. A strong melee warrior with a powerful charge and the ability to reconstruct itself after taking too much damage." Izuku answers diligently.

"I don't really understand." Ochako replies.

"It is perhaps better to show than tell, that is probably why we are doing these tests." Izuku says wisely.

"A grip test? Perhaps it would be more useful to provide my specifications." Izuku says as he slices the tester in half with his mechanical fingers.

"I'm just giving you an infinity." Aizawa mutters before stopping Momo from also destroying her tester with the vice she created.

"Ah, the long jump, finally a chance to showcase the true power of my quirk." Izuku announces as he walks towards the sand pit.

As he arrives he bursts into golden light and a five meter tall walker appears in his place.

"I thought his quirk was his massive body?" Momo questions.

"My quirk is called Purifier, I turned into an AI of sorts with a large assortment of bodies in a pocket dimension. I mostly remain in my sentinel form, as it is closest to a human. But I am comfortable in all forms, including this one, the instigator." Izuku explains as he acclimates to his four legged form.

"Just do your jump." Aizawa instructs with a bored tone.

With that encouragement Izuku disappears and reappears on the other side of the pit in the blink of an eye.

"He gets faster as he gets bigger?" Ochako asks.

"No, I just gain different abilities." Izuku says as he blinks back into position causing Ochako to jump at his sudden appearance.

"It looks like super speed to me." Ochako says.

"It isn't. There would be wind pressure if he actually moved." Momo lectures.

"Indeed, I can blink to any location within line of sight." Izuku says.

'Maybe I should have returned to sentinel form.' Izuku thinks as he awkwardly side-steps in his instigator form, blinking every four seconds. 'The three blinks at the start probably pulled me through though.'

The rest of the class was relieved somewhat to see an event where Izuku wasn't dominating.

The time had finally come for the ball toss and Izuku was at a conundrum. Quite a few of his forms were useful here, each with unique abilities. He considered his adept form, to just send an image with the ball, or perhaps a disruptor, to cause such an explosion the ball would never be found again. Or he could bring out the big guns so to speak and go full Carrier, but that would be showing a few to many cards.

In the end he chose Immortal, to just blast the ball as far as possible. With another burst of golden light Izuku transformed once more, now even taller and sporting a pair of massive cannons.

"That's the robot that saved me at the entrance exam!" Ochako shouts as soon as the light faded.

"Indeed, i feel we are about to see something impressive." Iida says.

"What did he do at the entrance exam?" Momo asks.

"In that form he took several hits from the zero point robot while blasting it to pieces with those cannons! The pulsing thump of the cannons made it feel like victory was inevitable." Ochako reminisces.

"I seem to have forgotten to place the ball somewhere useful." Izuku says with a thundering voice.

Indeed the ball was just sitting at the feet of the six meter tall siege walker, and with a complete lack of arms, Izuku was unsure how to retrieve it. Lucky for him Aizawa notice his problem and in a rare show of courtesy, or perhaps just not wanting to spend more time watching Izuku shuffle between forms, Aizawa tossed the ball in front of Izuku who immediately blasted it with his twin phase disruptors, sending it forward at near relativistic speeds. Izuku proceeded to fire a second volley just underneath the ball as it flew, sending it up and out of sight.

"The ball has gone out of range." Aizawa says, "But since it probably won't go into orbit I'm giving you an infinity minus one."

That earned Izuku a smug grin from Ochako, which Izuku didn't have much of a response to given his lack of mouth.

Izuku returned to his sentinel body for the remaining tests, but none of them were particularly exciting. Since he never got tired he tied with Momo in the distance run, enjoying some casual conversation as he jogged next to her moped. Toe touch was difficult but his mechanical frame was at least average in flexibility if you could even call it that. Unfortunately sit ups proved difficult with digitigrade legs, and it proved to be his worst event.

"These are your results." Aizawa says lazily, "Learn from your experience and so better next time."

"You got the top score, as expected." Ochako says kindly as the class begins walking towards the changing rooms.

"Your score was impressive as well, with some training, I can see you becoming a top hero." Izuku comments.

"Really? I didn't think I did so well." Ochako replies.

"I can tell you have never had the chance to really train. With a basis as strong as this, your limit must be impressive. Perhaps I can train you some time, my hand to hand skills could use some work and dodging your instant win attacks would be good practice." Izuku explains.

"Wouldn't your attacks really hurt?" Ochako asks nervously.

"We won't begin with me attacking, not until we build up your strength and speed, not to mention teaching you how to take a hit. Our training will take time but will have excellent results." Izuku says proudly.

"Ok! I will do it." Ochako agrees cheerfully. "But we can't stay too late or I might miss the last train."

"No worries, I will simply carry you home if this happens." Izuku declares.

"Won't you get in trouble for using your quirk in public?" Ochako asks.

"Not at all, due to my excessive dimensions I am unable to use most forms of transport, so I have special permission to use my quirk to travel, weather that is running or flying." Izuku says.

"You can fly?" Ochako asks with growing excitement.

"Even into space." Izuku answers, "Perhaps you could ride on my observer form, though I would have to stay rather low and slow to keep you alive."

"That sounds exciting. If I get a space suit can I ride you into orbit." Ochako asks.

"Um, yes." Izuku answers wondering if Ochako was going to notice the interesting connotation of her words.

"I'll get one soon then!" Ochako cheers before walking into the changing room behind the other girls.

'If nothing else UA will be exciting with her around.' Izuku thinks.

AN: There's the first idea, and probably one of my better ones. The sheer amount of OP with this quirk is alarming. Imagine Fenix/Talandar from SC2 Co-op but with all purifier units, the only downside is he can't appear anywhere he wants. Honestly his Immortal form beats any villain Izuku faces easily, Nomu is hard countered, Shiragaki's quirk won't work on his shields and if he gets tough just change forms. Stain is a joke to someone without blood... and so on...

I guess I should provide additional context about this story. I will write random chapters with different quirks I think of related to Starcraft. Izuku won't always be the one with a Starcraft related quirk. All these ideas are available for inspiration to anyone who wants to give them a go; just send a quick PM so I can read what you write.