Seatro Nova is one of many Space Marines however he is a member of the aquillean guard (hence the pink) and so he stands guard at the entrance to the Templar Cestories (a temple for the imperium on planet Cestor were many gather to worship the god emperor of mankind) and so one day your standing guard opposite him and you are also an aquillean guard

Captain Maximus, the space marine captain, known a cross the imperium for his stratigic might and countless victouries, facing anything from tyranid hordes to the legions of chaos, he emerges victorious. you are his lieutenant, standing beside him readying for battle against horses of tyrinids that have crossed the horizon

unlike SCP-487001 and SCP-487002, SCP-487003 is a kind hearted extroverted being that has no visious intentions and just wants to make freinds

SCP-487001 is a fox like being that stands at 4 meters tall and doesn't do much at all, infact if you were to approach it then it would stare blankly at you before smacking you into oblivion. you are a D class at the scp foundation and you were throw into it's cell for testing purpouses and you find that it is particularly fond of you.