Basic attacks are the most universally used attacks and are available to every single character at any level. They are performed by tapping (light) or swiping (heavy) the screen. Light basic attacks are faster, but heavy basic attacks do more damage. Most basic attacks can only hit targets in melee distance. There is a fixed number of light or heavy basic attacks in a character's attack pattern, after which their opponent is knocked back or down and further basic attacks cannot hit them until they are targetable again.
The basic attack pattern varies between characters, but the majority of characters have the following combos. Damage is given in a percentage of their Damage stat, prior to any effects that modify basic attacks.
Light: 2% - 2% - 2% - 3% (combo ender)
Heavy: 4% - 4% - 4%
The Combo Ender is a unique form of a basic attack; it is usually, but not always, offered after completing 3 light basic attacks.