The Concept Artist in a Game Development Studio, is assigned at the very start of a project, working closely with a Director, to dream up the intended look and feel of the characters and environments in a game, in 2D form or even 3D Form.
The role of the gaming Character Artist is to design the characters in a game, starting from 2D Sketches, to 3D Render. This involves modeling and texturing the character with the relevant 3D Software.
Animators are story driven. An Animator breathes life into a modelled character by making it move, talk, and express emotions. The animation team will usually have reviews with the studio's Animation Director and the Director of the game.
Storyboards may not be done for VFX projects, however you may come across "Previs''. Previs Artists create rough, most times grayscale 3D models and environments, to place in a scene in order to map out the general camera angles, layout and animation for a scene.
The Layout Artist will use storyboards as reference to create camera angles for a scene, as well as placing or 'laying out' the props and environments made by the Modelling department.