Anime Verus! is a crossover video game between several anime series. These series however only are from the shorter anime series (with the exception for a few anime like Soul Eater and Higurashi etc.) and are not part of shounen anime, meaning they haven't appeared in the crossover video games based on Weekly Shōnen Jump.
It is an 3D environment fighting game, meaning that you can move and fight in all possible directions of a 3D battle field. There can be a maximum of four players during a fight.
Every character has a different set of moves, magic, weapons that can aid them in their combat. Everyone is able to battle against another character. For example characters without any special abilities like Rena Ryuugu should be able to fight against Mewtwo.
The current moves can be set in the character's profile, which you can edit before going into battle. n story mode it can only be done when not in a fight, in the pause menu, while in Versus, or similar modes it has to be done before the battle or just by customizing the characters in the roster without going into battle afterwards.
There is a level up system for everyone. The higher level you are the more and stronger abilities you obtain. It will not increase power etc. however. During fights you have a HP bar and a SP bar. The HP (Health Points) bar shows how much health you have left. The SP (Special Points) bar however shows when you can execute your special attack.
The game (currently) features a total of 82 characters from different anime. Also there is one special guest spawning from a video game, and 4 characters originating from an manga/comic-styled webcomic.