Height: Variable (primarily 5'8 (1.72m) | Build: Variable, Primarily lean yet curvy

As a schifter slime, Marceline is of a green variant. Should she completely relax her shape shifting instincts, she would be a small ball of slime, semi-spherical, translucent, gelatinousy in nature with 'cartoonish' eyes dotted on the 'front'. She however can change her color, size, and even the race she would be identified as. Primarily, she takes the form of a noble girl from a long living 'angelic' line.

In her primary form, Marceline is a young looking woman from one of the longer living races. Her age as a slime roughly lining up with how this race would also appear at such an age, allowing her to appear incredibly youthful, but the age behind her eyes sometimes being apparent without sounding alarms. As a humanoid species it is nearly impossible to discern her as a slime in her primary form unless she were to directly give someone a hint or slip up. The touch of her skin is the same as the touch of flesh, and she has learned to even mimic bleeding or other reactions to harm should she need to, though would of course prefer to avoid them if needed.

Her hair is a vibrant green, reminiscent of the shade of her true form and a change she made to make herself feel more comfortable. Her lean yet curvy frame is neither athletic or soft, though to those unaware of her shapeshifting nature it would at least feel clear she looks after herself in numerous ways.

Typically she will be dressed in higher class fashion items, ranging from dresses and gowns to more simple items that are just made of finer fabrics or hold respected brand name. She can at times generate her own clothes with her shifting capabilities, but enjoys to be a 'base' person and wear actual clothes due to how they feel against her skin.

Really, Marceline's personality can vary greatly depending on who is observing her. If ever seen in her slime state, Marceline can actually be rather shy and nervous, feeling immensely uncomfortable revealing her true self. Even as a humanoid slime, while holding more comfort and a sense of power, her fear of being revealed can lead to more aggressive and offensive behaviours, using her capabilities as a slime to do damage to the observer.

More typically however, seen as how she wishes to be seen, Marceline is a rather bubbly and vibrant personality. She can be kind and generous, and more often than not looks to make friends where she can for genuine hopes of friendship, or perhaps faintly more selfish pursuits, but 'bubbly' is easily a word used to describe her regardless of the intent behind her actions.

Of course, as hinted above, this is perhaps just a surface performance. Marceline is genuinely a very happy person when being percieved in her more comfortable disguises, but beneath the surface is a mind that's learned to take more calculated risks to keep her life as it is. She can often make friends that clearly do not mesh well with her to outside observers, solely to further her 'families' status, or to further her own continued charade.

This slime, for dozens of years was a simple slime. There really isn't much more to say. Living in the outskirts of Regnum's capital city, the shifter slime's she lived with were simple creatures, some remaining as little blobs, others like herself attempting to achieve more humanoid forms, but all seen as equal in her group. Whether you could stand tall and on two legs like a human or preferred to be a little blob, it didn't matter, they were all in it together as it were.

As years went on though, the slime herself grew curious about the other races, the more civilized ones who lived within the walls of the city. There was something about them she felt more...at home with, than her literal brothers and sisters. While they could communicate well, she was the only one of them to even breach an attempt at imitating speech, or going beyond the simple humanoid structure of their forms, and attempting to mimic flesh or even fur. Of course there was only so much she could learn from afar, and feeling a little beyond her own community, she attempted to venture into something larger, to learn more about these creatures who intelligence she felt she shared.

Invading the capital was quite easy for a slime. Seen as nothing to worry about in her smaller form, but incredibly flexible in her uses of it, she managed to slip through literal cracks in defenses, and eventurally stole a robe from a washing line to disguise her slimy state as she took a more humanoid size.

She didn't need for much, draining the odd bucket of water or dipping her fingers into a well here or there to sustain herself, she spend weeks watching these other races much closer, her shapeshifting advancing further and further as well as her speech. She still couldn't hold a true race's charecteristics for long, but she was getting there by the time she truly had contact with her first person.

An apparently young girl by the name of Marceline, a nobleman's daughter, ran into her in an attempt to sneak out of town themselves. While the slime was fearful of being revealed, the young girl seemed more curious than fearful, and beyond the brief misunderstanding of intentions, actually became quick friends. The slime had no one in the city they could rely on afterall, so were immensely quick to form a bond once Marceline had displayed a level of trust between them.

Over the course of about a year, the two would meet carefully in secluded places, the slime telling the girl of life outside the walls while Marceline helped further the slime's knowledge that intelligent races shared, and aided in the furthering of her mimicry abilities by allowing the slime to mimic her. Almost a year and a half since they met, it seemed the girl (with the patience of a saint thanks to her race's long lifespan) had a purpose for teaching her friend the slime to mimic her.

When she'd first bumped into the slime she had longed to be an adventurer but knew the risks of telling her father, or the manhunt that could come if she were to leave unnanounced. So, with the slime able to mimic her almost perfectly, a deal was made. The girl would get her adventuring kick while the slime took her place. With the plan made, a few more weeks, maybe even close to two months were spent solely preparing, teaching the slime every deep secret she had so no one could tell the two apart, while the slime perfected her mimicry further, even learning fragments of other languages Marceline herself knew.

For a year onward, the slime would come to know themselves as 'Marceline'. Living under the roof of her friend as they tried the life of an adventurer, the slime's natural talent for mimicry seemed to advance their ability to lie to the girl's family...though as time went on, and she recieved sparser letters from her friend on their travels, the new Marceline began to believe the lies a little. This family was nice. Sure the father could be a little ruthless with his business but she oddly admired that. When the letters from her friend stopped coming altogether, the new Marceline had become so accustomed to the inherited life that she didn't even think to worry.

She only remembered the true Marceline when she came back.

As it turns out, for months the true Marcie had been struggling with the life of an adventuer. Their beginners luck ran out, they faced monsters they feared too much, and their pockets had been empty to the point they had to beg and live on the streets solely to find the florence needed to reach home. Attempts to write letters were even dismissed by the house staff, believing them to be hoaxes for containing miss Marceline's name, with such scruffy, low class parchment.

Eventually she did make it home to the face of her old friend the slime. The slime, so accustomed to the new life they lived grew fearful as they, infront of the Labelle family, tried to brush off the past year, admitting the trickery to the Labelles and saying simply 'gigs up, time to trade back okay?'

In the face of this, the slime remained silent as all eyes turned to her. She stared wide eyed at her old friend, the girl who had taught her how to become more than her slime self, to read, to write, to enjoy the life of an intelligent species like herself...she had even given her a taste of the finest example of such a life.

"Father. Do we really need to entertain this crude shapeshifter?"

Many might feel they should have been destroyed by the look on Marceline's face as those words left her lips. How even if they hadn't, they wished they had the heart to feel the devestation, and empathize with this girl who, in that moment, realized there was a chance she could lose everything she'd left behind. The slime has, and never will wish, she could feel that, for she knows how immense such guilt would be. Instead she lingers on the odd...delicious sensation she felt, whent the family believed her over the 'imposter', in raggedy clothes, scrounging for coin.Maybe someday she'd feel guilty for what she did...

The old Marceline was taken in for impersonation charges. Regardless of her story the Labelle father could pull strings to get the charge to stick. The slime heard little of what happened from there. She was at the court the day the charges were issued, and recalled the minimum sentance being 6 months, but what happened after? She's completely unaware. She lied to her new father, telling them the court made them feel uncomfortable. Her father told her some time later it had been handled, but the slime learned little beyond that, not really wanting to hear anything more.

Now however, the new Marceline, nearly a half dozen years later, completely enjoys the life she lives.