Hi author.
Some feedback for you -
Firstly and most glaringly when you look at the page, at least to me, is the fact the JPG image is broken.
SCP-2561 is contained in a metal chamber of 5m x 10m x 6m.
That is a huge room, even if The Foundation are being kind to a rabbit and wanting to give it enough space. Humanoid objects often get smaller rooms than this, let alone what, as far as I can tell, is a 'normal' sized rabbit!
[…] it's allowed to roam the facility.
I know this can be tempting to allow when it's your SCP object, or when the SCP object seems 'harmless', but it's generally not what would be done. For a start, it's a normal sized rabbit hopping up and down corridors - there will be places it can get that may be dangerous to it, or dangerous to staff. It could easily get hurt, especially if there was a breach. It may even cause a breach, squeezing into a space too small for humans. It's not a little bunny you know is hopping up and down your house - it's a little bunny hopping around a place with loose electrical wires, gaps behind important machines that could be chewed and peed on, people marching up and down corridors that could accidentally kick this SCP object …Not to mention there would be little rabbit pellets everywhere! Remember the motto - secure, contain, protect. Secure the rabbit in its more than large enough containment chamber - Contain it there so it doesn't get hurt or hurt anyone else - Protect both the subject, other SCP objects, and the staff from getting hurt.
It refuses to eat vegetables with any other color, and any other kind of foods.
The biology of this rabbit would have to be explored. If I remember correctly from years of working in a pet shop (also years ago), rabbits cannot exist on vegetables, especially vegetables of a specific colour, alone. Tomatoes, whilst not harmful for a rabbit to eat, are unusual and also potentially unsafe - rabbits should only have up to two tablespoons of fruit a day, due to the sugar content. There's no way a 'normal' rabbit could safely eat enough fruit to sustain itself. Too many carrots (e.g., enough to support a living animal) could cause vitamin imbalances, whilst lack of other food could cause undernourishment. It is vital that rabbits are given hay, as well as pellet-based food that contains all the vitamins and nourishment they can't get from vegetables alone.
So really, unless the biology of this rabbit is wildly different (and it may be, considering what you go on to describe), it's not going to be around long with that diet.
It has a neckband with a nametag. The nametag says: "Jupiter".
Again, the photo doesn't work but the caption does - if it didn't have a neckband when the photo was taken, when exactly did it gain this neckband? Is it simply because you had handy a photograph of a rabbit, but no photograph of a rabbit with a neckband? You don't need to try and cram anomalous effects in based on a concept that can't be seen in photographs.
The last paragraph was, overall, a confusing read to me.
So it does no harm to humans - but bites humans? Even if that causes an anomalous effect, isn't that 'doing harm'? Causing personnel to experience no pain isn't as good as it sounds, as pain is essential for telling us when we need help - you don't want a staff member who has been bitten by this SCP object going around unaware that SCP-X just breached and attacked them, but they don't know because they couldn't feel the pain.
The 'other rabbits' line feels thrown in and unneeded - you could just say its anomalous effects only affect humans.
You contradict yourself quite soon in this last paragraph -
SCP-2561-1 feels no pain […] meaning it cannot feel pain […] If SCP-2561-1 is hurt while having the effect, SCP-2561-1 will feel pain for approximately 5 seconds.
Which is it? Do they feel pain, or do they not feel pain? I read the paragraph through a few times, to make sure I wasn't confusing the initial effect with the long-lasting one, and I don't think I am. You seem to imply the bite is painless, but also that the subject develops the inability to feel pain, but then states they can get hurt and do feel pain?
This effect is called "Potestas of Jupiter", Which is the Latin translation of "Power of Jupiter".
Although research and an interesting foundation is nice to see, I feel like this was tacked on after you had the idea for a creature of some kind that 'cures disease', which seems to be the ultimate end for this SCP object. Hence why the non-working image would contain a photograph of a rabbit with no neckband. So really, the SCP object's form is redundant - it could have been any animal that happened to be referred to in some way as Jupiter.
All in all, this is quite a confusing SCP object. I can't understand why it does what it does - why a rabbit? - and The Foundation wouldn't be so daft as to let a small rabbit bounce around a facility on its own, considering how much they chew, pee, and crawl into tiny gaps humans can't get into. The last paragraph is confusing overall, and doesn't lend much to the SCP object itself. I think you need to go back to the drawing board with this idea, and start over again. It just doesn't work.