Arrancars are a group of Hollows that gained similar powers to that of a Soul Reaper by removing their masks.

Espada: An elite group of ten-ranked powerful Arrancars in Y/N's Arrancar army, serving as his direct subordinates.

Números: Combat experts in Y/N's Arrancar army. The moment they are "reborn" from into Arrancar, each member of Y/N's army is assigned a two-digit number, starting with 11. This number indicates not the order of the Números' strength, but of their birth. Thus, the higher an Arrancar's number, the younger they are.

Fracción: They are Arrancars that serve a specific Espada. As proof of their status, the Espada have the right to select subordinates from among the Números to supervise directly. They can choose one or many Fracción, or even none at all. 

Privaron Espada: An Espada may be demoted from the group either when they lose strength or cease to be useful to Y/N. In most cases, they will be demoted to the Privaron Espada who are former Espada that have officially lost their rank and are assigned a three-digit number. Being former Espada, they are far stronger than the normal. 

Espada members; 

1. Coyote Starrk and Lilynette Gingerbuck: 

2. Baraggan Louisenbairn: 

3. Tier Halibel: 

4. Ulquiorra Cifer: 

5. Nnoitra Gilga : 

6. Grimmjow Jeagerjaquez: 

7. Zommari Rureaux: 

8. Szayelaporro Granz: 

9. Aaroniero Arruruerie: 

10/0. Yammy Llargo: 

Privaron Espada members;

Arturo Plateado: 

Dordoni Alessandro Del Socaccio:  

Cirucci Sanderwicci:  

Gantenbainne Mosqueda: 

Nelliel Tu Odelschwanck:  

Luppi Antenor:  

Fracción and Números members; 

Shawlong Koufang:  

Edrad Liones:  

Nakeem Grindina:  

Yylfordt Granz:  

D Roy Rinker:  

Aisslinger Wernarr:  

Demoura Zodd:  

Charlotte Chuhlhourne:  

Abirama Redder:  

Findorr Calius:  

Choe Neng Poww:  

Ggio Vega:  

Nirgge Parduoc: 

Loly Aivirrne:  

Menoly Mallia:  

Kukkapūro:  

Pesche Guatiche and Dondochakka Birstanne:

Tesra Lindocruz:  

Emilou Apacci: 

Cyan Sung-Sun: 

Franceska Mila Rose: 

Rudbornn Chelute: 

Wonderweiss Margela:  

Szayelapporo's Fracciones:  

Roka Paramia: 

Asguiaro Ebern: 

Lüdaas Friegen: 

That's all for the Arrancar army, let me know what you guys think at the comments below. Peace out and enjoy!