Per 
El Gato Diablo
Containment: scp xxxx is to be kept in a 3 m x 3 m x 3 m chamber, with a scratching post, heated blanket, and litter box. Scientists and D Class personnel are allowed to interact with scp xxxx, but are advised to treat the entity with respect at all times.
Description: scpxxxx is a small housecat with a black coat and amber eyes. The entity was previously stray, until a scientist found it wandering outside site (?). The entity seems to friendly with most personnel, often greeting them by rubbing its head on their legs or mewing excitedly. Scp-xxxx seems to exhibit extradimensional properties, although using them rarely. The entity can create gateways to what seems to be its own pocket dimension, but spends very little time inside. Once inside the dimension, scp-xxxx is able to change it's biological structure from that of the felis catus to that similar of the panthera species. Once the change occurs, the entity will attempt to kill anything perceived as a threat, and will revert back to it's original form soon after. The gateways are able to manifest within 5 m of the entity and seem to dissolve if scp xxxx is out of range. It appears the entity is capable of creating up to two gateways at any given time, often using them to ambush a threat.
Incident 1: for an experiment on scpxxxx behavior, two d class personnel entered the chamber. Scpxxxx greeted them excitedly by walking up and rubbing its heat on dxxxx's leg. Dxxx2 seemed to be revolted by the cat, and gave it an irritated look. Scpxxxx looked back curiously and playfully pounced on dxxx2's leg. Dxxx2 yelled out, seemingly caught by some of scpxxxx's claws. "Stupid fucking cat!" He yelled as he kicked the entity towards a wall. Just before scpxxxx hit the wall, two black gateways formed, one (gateway A) where scpxxxx was about to impact, and the other (gateway B) on the opposite wall, behind Dxxx2. The cat disappeared into gateway A and reappeared as scpxxxx-a through gateway B. The entity pounced once more from behind Dxxx2. The entity bit the back of dxxx2's neck and dragged him into gateway A, which immediately closed, severing Dxxx2's left foot. Scpxxxx, reverted back to it's original form then exited gateway B once more and closed it behind itself, leaving Dxxx2 never to be seen again. Scpxxxx proceeded to groom itself, removing the blood from around it's mouth and paws and then laid down beside Dxxxx, purring. Dxxxx sat still, staring at the servered left foot of dxxx2.
Fix this one in the future.
Maybe a joke
Keter class
The groove is a humanoid entity with a boombox in place of its head. It is reported that it wears a denim jacket (embroidered with a large peace sign on the back),patched jeans, and red converse shoes. This being seems to manifest (very rarely) inside a populated city block, where it begins to play popular music from the 1980s. The music can be heard subconsciously within a 30 meter radius, and those who hear the music are compelled to find the source. Upon discovery, the entity will then begin to dance. Anybody who witnesses this performance will then be compelled to join it. Once a crowd form around the entity, it will then start to move through the streets, with it's new follower behind it. It will then start to parade through the streets, gaining new members as it navigates through the city, still dancing. This will continue for a duration of between 1 and 3 hours, or until it cannot continue on its current path. At this point, The Groove will de-manifest, and all people who joined it will say goodbies to eachother, and continue on with their day.
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