Joshua Speirs is from the UK, before the apocalypse he was in the Royal Navy, he was stationed on HMS Dragon (irl ship) and was deployed with the royal navy being part NATO, was originally part of the intervention and help which chernarus was getting at the beginning of the outbreak. the ship was used and helped in medical evac for the troops defending against the Russians however someone came back to the ship infected, leaving a butterfly effect and essentially making Dragon a sitting duck, it was utter panic and chaos and eventually the ship was abandoned due to the overwhelming amount of infected. luckily him, and a few officers and rating left in a helicopter that was on the ship, however was eventually shot down (being one of the heli crash sites on the map) and his story goes from there .since it started, he has wondered the wastes, looting and scavenging, defending himself and killing infected. he never stays in one spot and moves from town to town occasionally staying for a couple of days then moving on. he is a generally nice and friendly person who would do anything to help anyone out and puts a lot of faith and trust in the rest of what is left of former humanity.
due to his basic training from passing HMS Raleigh, Speirs is familiar with firearms and basic militarization, he knows how to hold, control and use weapons and is fundamentally ready for anything thrown at him. He also treats people the way he would want to be treated and hasnt lost any sanity what so ever over the apocalypse.
Speirs is also into British bands such as Oasis, catfish and the bottlemen, stone roses, arctic monkeys, smiths, etc and most of the time will have them playing with an mp3 player he has with earphones in, and was in a band as the lead singer, aspiring to be just like Oasis frontman Liam Gallagher.