A "customisation system" refers to a feature or process that allows individuals to personalize or modify something according to their preferences or needs. Full definition
We actually had a character customisation system in the game, where you would level up, like if you'd play a bunch of Reaper, the Reaper would get higher level and then you had abilities you could choose from. (gamereactor.eu)
Players can create there own unique vehicles and charactors through the game's customisation system which will help them stand out from other players online For more on the fun looking VR Karts check out our interview in the video below. (teamvvv.com)
Unique «Blessings» based weapon customisation system — Combine and stack «blessings» to create hundreds of thousands of unique weapons, blessings combine to give a high level of depth. (perfectly-nintendo.com)