Per 
Item: SCP-5146
Class: Euclid
Special Containment Procedures: SCP-5146 is to be put in a 20m x 20m x 20m room with basic furniture, a bookshelf and a large, bright window. 2 Level 3 or above personnel is to care for SCP-5146.
During total power failure, it is recommended to have at least 2 Level 3 or above personnel to supervise SCP-5146 in case of a Containment Breach.
Description: SCP-5146 was found in 20██at [DATA REDACTED] by Agents T████ and M██. It appears to be a 13 year old male of Asiatic origin, approximately 1.6 meters in height and approximately 50 kg in weight. It wears glasses. It is generally calm and nice if approached in a friendly or neutral stance, but if it senses hostility from a person approaching, it will teleport behind said person and knock them unconscious. It is Euclid as it is unknown what it sees as hostile.
When first found in [DATA REDACTED], it is seen reading [DATA REDACTED]. Agent T████ tries to approach it with a friendly stance, in which she is replied by a greeting. When another person inside [DATA REDACTED] approaches SCP-5146 with hostility, trying to hit him with a stick, it teleports behind said person and knocks said person unconscious, leaving no memories behind.
Agent T████ reveals herself to be our agent and requests SCP-5146 to go back to Site 19 for research in a neutral tone. SCP-5146 takes this comment with skepticism as SCP-5146 hates confinement (See Addendum), but when told the Foundation is Cold, not Cruel, SCP-5146 willingly entered Foundation Custody.
Optional Information: It seems to have a rivalry http://www.scp-wiki.net/scp-173 and is one of the few contained entities that can temporarily halter SCP-173: When SCP-173 attempt to snap SCP-5146's neck, SCP-5146 will teleport behind SCP-173 and knock it back to its containment chamber. It finds http://www.scp-wiki.net/scp-4991 funny.
Timeline:
██/9/20██: Discovered, entered custody
██/10/20██: First sighting of it haltering SCP-173
██/10/20██: Conversation held between Agent T████, Agent M██ and SCP-5146, shown in Addendum 5146.1.
Addendum 5146.1: Interview
Interviewer: Agents T████ and M██
Interviewee: SCP-5146
[BEGIN LOG]
Agent T████: Good afternoon, 5146.
SCP-5146: Good afternoon.
Agent M██: We have a few questions.
SCP-5146: OK.
Agent T████: Firstly, can you explain how your powers kick in?
SCP-5146: I was originally a normal boy like everyone else, but I was bullied all the time. One day, when the bully tried to insult me, I knocked him unconscious. I found out my powers and was scared, and I am on the run after on until you nice people took me to custody.
Agent M██: Who is that person back when we found you?
SCP-5146: One of the bullies, and the worst one!
Agent M██: So… why did the powers get activated when people are hostile?
SCP-5146: Hey, if the world isn't nice to me, I wouldn't be nice to it either.
Agent T████: How did you beat SCP-173 back to containment?
SCP-5146: I dunno… there is just something about it that I hate…
Agent T████: Why were you taking skepticism when we are revealed to be SCP agents?
SCP-5146: I dislike confinement. Small spaces makes me feel uncomfortable.
Agent M██: Thank you.
[END LOG]
Addendum 5146.2 D-Class experiment
Several D-Class were taken to conduct an experiment.
| D-Class description and Origin | Action | Result |
| D-12565: D-12565 is a Caucasian male 20 years of age. D-12565 has short blonde hair. | Approaches SCP-5146 in a positive fashion | Friendly conversation |
| D-16256: D-16256 is a African male 40 years of age. D-16256 has black dreadlocks. | Approaches SCP-5146 in hostile fashion | SCP-5146 teleports behind said D-Class in incalculable seconds, knocking said D-Class unconscious |
