Transformers ½.

Before Transformers the film 2007 Megatron and one other found their way to earth. Megatron landed in the north pole , the other one of them crashed in a certain cursed training ground in China. And three guesses as to who get it's powers. Of course it's Ranma.

Previous chapter

"I heard the story from your father, HOW TRAGIC!!" the man known as Soun cried, "But seeing hot water changes you back," He threw the water on the car, "These are my three daughters, Kasumi age 19, Nabiki age 17 and Akane age 16. One of them will be your fiancée." The car had melted away, leaving a young teenager standing in the bathrobe. He looked at the three girl, "Saotome Ranma, Sumimasen."

Chapter 02

Ranma looked at the three girls, before shaking his head, "I cannot make a choice, not yet at least. The four of us have just met, it would be unfair to them to force them to be with a person they might not like."
"Why not. You are a boy, aren't you? You would love to get the chance!" Akane shouted.
Ranma looked at her, "Thanks to pop's training journey I am also part machine. Machines aren't guided by hormones, but more by logic. Even those with a sentient mind. I want a kind of control that can only be obtained by trust. That's why I can't make a choice, it is one of you who needs to agree to this."

Both Kasumi and Nabiki silently gave Ranma several plus points as the boy at least acted more mature then he seemed. Akane however still didn't trust him.
"This 'transformation'... how does it work?" The second-born daughter asked.
Ranma looked at her, "The moment I am hit with cold water, I change into a robot, then I can choose a 'body' which will be my base-form. The base-form also can transform into a robot, only it has the same mass as the base-form. I can talk though and I can upgrade myself to another model of the same device, a car to a different car but not a car to a plane," Ranma explained.
"So any device?" Nabiki asked.
Ranma nodded, "Only if there is a example nearby, but it can be any device. A tv, radio, car, plane, military vehicles. Everything."
"So, if I wanted you to change into a camera?"
"That wouldn't be what you want, but what I want as 'base'. But then I have to see a camera to copy. I can also change into a fully working coffee-maker, which can transform and bring it up to you."
"Yes, please," Nabiki moaned.
"Speaking of which," Ranma spoke as he slammed his fist in the palm of his other hand, "I want to help around the house."
"I can't ask that of you," Kasumi objected, "You are a guest."
"I am a guest," Ranma agreed, "but no freeloader. I can still make myself useful as a vehicle. You can use the space I have for groceries or something. Or I could transport you on a trip to somewhere."
"Like where to," Nabiki asked.
"Anywhere! Remember with hot and cold water I can change to another vehicle. So anywhere is possible. To the airport as a car, hot water, cold water, I choose a plane and we'll take-off."
"What about gas? We can't keep paying for you to drive."
Ranma smirked, "I run on Energon, a different energy, the only equivalent I could find was the Nuclear fusion."
"Fusion?" Kasumi asked, "People are still discussing the theory of it, aren't they?"
"Didn't I mention I have direct access to the internet when I am a machine."
"NO, YOU DID NOT!" Nabiki screeched.
"Oh, sorry about that."

Genma nudged Soun, "I feel the chemistry between those two."
"Yes, it appears Nabiki is the best choice."
"It is best if the two of you would shut up before you say something stupid," Ranma spoke up.
"WAAH!" Soun cried, "Your son hates me."
"I don't hate you, I know my pop," Ranma smirked, "We told them all know about my transformation," He looked at his father, "but not about yours."

"You can also change into a car?" Akane asked.
"Not really," Ranma answered, "I was completely human when we left Japan, but I left China as part machine. Thanks to pop and a visit Jusenkyo, the pools of sorrow. It is a training ground filled with pools and in each spring something died. I fell into an unknown spring, which apparently coexisted near the spring of the drowned girl, yet was still separate,. Whereas I picked up this 'curse', pop fell into Shonmaoniichuan, the spring of the drowned panda."
"Ranma! How dare you to tell them that!"
"They're going to find out anyway, and besides isn't it your fault? Having a guide without being able to READ THE BLASTED THING!" with that Ranma got up and threw his father into the air, causing him to land in the conveniently placed Koi-pond.
True to word, a panda emerged from the water, -Damn you, boy- a sign in the paws proclaimed. The panda ran over and grabbed a fist of the boy's shirt. Hosting him up into the air He clearly intending to return the favor.
Ranma started into the eyes of the creature, and glared, "Do you want me to get wet, pop? Remember my form. I can do a lot of damage to you," the boy spoke, a silent warning in his eyes. The panda swallowed hard but lowered the boy. The panda brought a sign down on top of the boy's head, -So can I, boy. So can I.- The sign split in half. -Huh?- another sign was held up.
"Pop!" Ranma whispered, his hand was placed in the pond, "Run!" Ranma grew and took on a metal shape. Soon a two-story robot was towering over the four people. The panda had fled inside. Luckily it was late in the evening so nobody was outside. The robot looked around before it stopped and, after a seconds, started shrinking again. Plates grew on his limbs as the robot seemingly imploded. Seconds later, instead of a robot, there was a motor.
"Ranma?" Nabiki breathed.
The headlights flashed. Then the motor exploded. Things twisted and turned before the eyes of the Tendo's. Soon a robot of about the same height as Ranma had appeared. A purple and pointy emblem on its chest. "I am Ranma Saotome, Sorry about this."