V - one of heroes Devil May Cry 5 - doesn't fight alone. Summoned creatures fight for him - his job is to give them orders. This is achieved with the buttons that other heroes use to perform direct attacks.
The Griffon - although more like an ordinary bird, accompanies V all the time. During battles, soaring in the air and attacks the target with rather weak balls of energy (using the RMB). However, do not underestimate the Griffon - after buying a few skills, it becomes a strong shadow partner, who greatly injures enemies with area attacks.
The Shadow - after a call, the demonic Panther will attack ground and air targets with strong attacks (using LMB). Unlike the Griffon, it tends to fall into lethargy more often (after reducing the health bar to zero).
The Nightmare - you can only summon it when, during the fight, you fill up the purple bars of the Demon Transformation. Then, by pressing F you will summon the Nightmare that will remain on the battlefield until the bar is reduced to zero (i.e. approx. 10 seconds by default). Buying purple Orbs lets you increase the length of the bar so that the summoned monster stays on the battlefield for longer. By default, you don't control the Nightmare - it performs several strong area attacks and disappears; however, you can change this by purchasing skills that will allow you to mount and control the Nightmare. However, it makes sense only when you buy a few violet orbs.
Using the combination: Q + Shift + LMB (Shadow) / LMB (Griffon) on the given target, you unlock the animal's auto attack (but it will also use the abilities you purchased). Such order uses up one bar of Demonic Transformation.