After a bit of deliberation, I decided a better fit for myself would be a Robin that was more... Well, influence by mildly spooky or darker elements, but who remained friendly throughout. Everything needs a little love! There's not enough friendly Bogeymonsters. My best friend and all around wonderful guy  wolfertech made this awesome ref sheet for me to show off the changes! Fav the original here: http://www.furaffinity.net/view/19859611/

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Robin is a Bogeymonster... A strange being from outside of the normal world, coming from some strange plane of existence where wholly unique beings live. His origins are a little guarded, which is a bit of an understatement for what is, in effect, an eldritch abomination. Still, if he is an eldritch abomination, he's one of the friendliest you'll ever meet, seeking no harm to any being save those who hurt his friends. Dubbing himself a Bogeymonster, and claiming to be of fae nature, though that is unsubstantiated, he settled in the mortal plane.

Robin's body is a fluid thing, not quite made of ordinary flesh, though it feels such on the surface. His body can easily flow into a few set shapes and in a couple ways. His six limbs remain in any case, though he finds it just as easy to walk on two, four, or all six, and his body shifts subtly to accommodate. He also adopted a few more easily hidden forms, based on some common creatures from the plane he settled on, although the details of each make him stick out like a sore thumb if he doesn't make an effort to properly hide his markings and sigil. Robin can assume the form of a standard house cat, a common raven, or a plushie version of himself or these, if he finds it to be more convenient or entertaining at the time. As well, it is very hard to actually harm him. His body naturally molds and deforms to resist harm, and as such, it's possible to flatten or shape him. Whatever kind of creature he is, it seems he has a strong tie to hunger, and as such his body is also naturally able to sprout a hungry maw from any point on it, leading straight to his stomach. As well, his shadow is also a part of his body. It can step from the ground, becoming three dimensional, able to interact with the material world... It thinks on it's own, though it is truly Robin... If slightly baser.

Speaking of his stomach, it is powerful. No one has yet found a substance that it can't break down and handily digest, nor one that can damage it, nor anything that could fill it... It has a theoretically infinite capacity, with some food stretching him out without limit, and some disappearing into a sort of stomach universe, sometimes merely in a bigger belly, sometimes large enough to house a whole other universe. Things broken down in it are briefly assumed into his nature, leaving a layer of pudge, an icon in the likeness of the meal in a stained glass design, and the ability to use some ability affiliated with the meal in question. After only a day, the layer of pudge will disappear no matter how large it was, and the icon usually follows suit. Robin does not take to harming his meals, and although his diet mostly consists of still living sentient beings, none are ever hurt. They merely reappear, asleep, at the nearest safe place to where they were digested.

Retaining a connection to the realm he came from, Robin is able to cross over into what he alternately calls Bogey Land, The Nightmare World, and Underbed via any points of significant and semi-permanent darkness such as a closet, underneath a bed or other piece of furniture, a basement, a cave, or things of that nature. Robin claims Underbed is a fully populated world of it's own, and though he hasn't brought anyone to it with him yet, there's nothing stopping him. In what he claims is a common feature of all bogeymonsters, Robin's gaze is able to clear a mortal's head of all but thoughts of serving their new friend, although he doesn't like to use this ability but on people he knows find it fun. In return, he can also be summoned at a whim. Anyone who has him in mind while speaking his name three times (Or, in some cases, being excessively hungry) will summon him. Summoning while too hungry is a little bit dangerous, as Robin might merge himself into the summoner, becoming a combination of them and himself. In this case, he usually goes on a ravenous spree, eating anyone and anything near why until finally sated (Or at least, pretending to be). After which, he tends to dematerialize and leave the possessed to deal with the consequences of his actions, like the extra pounds they'll be putting on.

Robin's Sigil, Hat, Glasses and Robes are things he is seldom found without. He claims them to be a part of his body, and though they can shift away as he wills it, they can shift back just as easily. If he ever loses them, he finds a new copy of each in very little time. Another detail that points to the link is the fact that the underside of the hat and any opening of the coat can also lead directly to Robin's stomach. Even the sigil, if Robin gestures correctly, will expand the gem in it's center into a window which can lead straight inside the bogeyman. His glasses are the only thing that he doesn't seem able to eat through (Though this is unconfirmed), yet not only does he have trouble seeing without them, but while not wearing them he seems to be able to see, at least partially, from their location as if they were his own eyes.

Though he would deny it, every now and then a friend of his manages to capture and condense him down into a soda which is said to be not only delicious, but capable of turning the drinking into a monster like himself, if temporarily.