Pride

Pride (Japanese:プライド, Puraido) was the first Homunculus created. Much like Sloth and Wrath, the role of Pride is two different characters in the 2003 anime and the manga.
Aside from the Homunculi standard powers, Pride's abilities lie within his shadow, which resembles the original flask-contained form of Father although much larger and more formidable with multiple slitted eyes and sharp toothed mouths. The shadow can take on a variety of shapes, from sharp spikes to tendril-like hands (similar to those seen within the Gate of Truth).

Pride can manipulate, slice through or devour anything that comes in contact with his shadow and it appears invulnerable to conventional physical harm, although it can be deflected by sufficiently hard objects (Carbon-hardened objects appear particularly resistant). He can also see and talk through his shadowy eyes and mouths wherever his shadow can extend, an ability he uses to watch over the country-wide transmutation tunnel, slaughtering anyone who enters it. It is implied by Greed early on (and later confirmed by Pride himself) that his shadows are in fact his actual form, with the child-like body being a simple "container" for him to move around in, similar to Father's flask-contained form. This is supported by the shadows limited mobility, only being able to appear in the immediate surroundings of his human body (Selim) and in the circular transmutation tunnel around Amestris. It also cannot appear without a light source and can be harmed when light becomes too bright.

Pride's shadow can consume living things and assimilate the abilities and strengths of that particular victim, along with their corresponding weaknesses (i.e. after devouring Gluttony, Pride gained an enhanced sense of smell along with Gluttony's ravenous hunger). After assimilating the Gold-Toothed Doctor in Chapter 101, Pride gains knowledge of human transmutation and activates a corresponding circle with his shadows.

However, after Pride had forced Roy Mustang to perform human transmutation and teleport to Father's den, he is assumed to have weakened his ability to use shadows because instead of counter attacking the Elrics' attacks, he dodges them and later he only uses them to fight in close combat. Edward states that this is because Pride's skill of forcefully opening another's gate carries that high risk.

In Chapter 104, Pride attempts to use his small size and speed to exploit Edward's weaknesses in hand-to-hand combat (being used to fighting people taller than him), but has his fighting style read easily by his opponent and is bested, before Father subdues an unsuspecting Edward in order to begin his plan.