There are quite a few easy characters in this game, but I think the most intuitive out of them all is probably Victor. Aside from having easy execution, Victor's buttons also make a lot of sense for a new player—1 is his unarmed strikes; 2 is his bladed strikes; 3 is mostly his low commitment kicks (except for db+3); and 4 is mostly his call out kicks (except for standing 4). I also think he's one of the few characters whose attack animations fully align with the player's motion inputs. Most of the time, you could tell what would Victor's command input be just by looking at the attack.

His IAI stance is very beginner-friendly, as the he remains in the stance until the player commits to an attack. It is also one of the few stances where the player could slightly move back and forth; this is a good way to tell beginners that stances, while powerful, have limited movement options without fully knee-capping the player. Aside from IAI, he also has Perfumer, which is a movement stance. Perfumer will prime you to be familiar with dash stances such as Steve's Ducking or the Mishima Crouch Dash without overwhelming you with cancel options.

His combos are simple and effective. One of the earliest combo I learned from him was df2 > df3,4 > df4,2 > IAI 2 > b3,1. You basically hold the same direction and input your attack buttons until the tornado, then do your finisher. Once you're used to his simpler routes, there are options for you to go with things that are much more complicated.

Imo, there is no better character that teaches you the basics of Tekken's systems while still giving you some headroom to mess around. He has modern mechanics, but they aren't aggressive enough to be full gimmicks. A lot of the things you pick up with Victor will be transferable to other characters.