Now of course, one of the best ways to attract viewers in the first place is to have a unique system, especially if most of the story revolves around the existence of one.
One of the most popular functions that a system could have (especially prevalent in system novels where the protagonists multiverses) is the shop function, where you can buy different abilities, techniques, physiques, etc. pretty cool concept overall.
And being honest, I have nothing really to say about the functions of a system. As long as you make it so that your protagonist can't buy this super omnipotentability for like five points, then I'd say you're pretty fine (unless you somehow fumble that).
End of today's lesson