Jin is a perfect all-round character in Tekken 8, who offers all kinds of tools to work with. He mostly excels in extreme pressuring and offensive game plans. There are great moves to choose from, such as 2,1 and 2,1,4, one of the best and safe pressure tools in the game. His greatest strength alongside pressuring is to get back into the game with moves like f,F+2, a fast mid heat engager with decent range, or uf+2, another safe move which evades a lot of moves in the game to help you get out of pressure coming from the opponent and of course, d+2, which is Jins only low counter-hit launcher in the game, with the property of evading high moves. Once it comes to mixups, your options with Jin are limitless. Especially at the wall, with the help of his ZEN Moves like ZEN3+4, which is a high and also a wall crush, making it +15 if you use it at the wall. The ZEN Stance is an essential stance that you will definitely need with Jin, since there are many moves that can transition into the ZEN Stance, giving you an endless amount of mixups.
Jin in Tekken 8 has been made more accessible and easier to use compared to previous TEKKEN titles, making him a good pick for beginners. For example, you won't need to learn wavedashing or get consistent with landing electrics. Moves like the electric (CD.df:2), Hellsweep (CD.DF+4,2), and also the thrusting uppercut (CD.df+1) have been added into his ZEN Stance, reducing the work of learning inputs like the crouch dash. Also, with the help of panic moves, like ZEN.u+1 which is a relatively fast launcher that evades highs and his low evading hopkick uf+4 can benefit you a lot in low ranks. ZEN.u+1 is launch punishable on block but always a good panic option, even in the highest level of play. As mentioned before, you also get many mixups with the help of the ZEN Stance. While Jin has gotten easier to play, he is still a very technical character to understand. The only thing that has been made way more difficult is his parry (b1+3 OR b2+4). The timing on his parry is very strict and Jin cannot parry Heatsmashes (all hits), throws, and unblockables. Mastering the parry and getting the timing right will allow you to heavily punish your opponents. So things like learning the wavedash, having consistent electrics, and being good with the parry will be necessities if you plan to main this character. Jin will fit those players, who like to play very offensively and oppress their opponents.
On paper, Jin seems like a very strong character and while he is strong, Jin is not difficult to counter for opponents and due to Jin being a very popular character, most opponents already sort of know how to deal with him. Some of his strong moves and his ZEN Moves can also be easily sidewalked, sidestepped or crouched. These things will most likely not be a problem in lower ranks but while you keep playing Jin and rank him up, you will start to realize that your opponents will get around your playstyle, which is why you will need to understand how his moves exactly work and how you can best utilize this character.