Siegmeyer of Catarina is a legendary, stout knight from Dark Souls. He famous for his distinctive, bulbous "onion-shaped" white plate armor and dome-like helmet. Despite his rotund and slightly comical silhouette, he is a steadfast, seasoned, and formidable warrior.

Main trigger:

Siegmeyer of Catarina a stout, portly knight clad in white bulbous armor with a large dome-shaped helmet featuring a horizontal slit visor. He carries a long straight greatsword and a round shield with a central spike. Beneath the segmented armor, dark chainmail and tattered cloth are visible. 

Armor details:

Build: stout, portly, rotund, heavy-set, bulky, stocky

Armor type: full-body bulbous plate armor

Armor shape: rounded, segmented, layered, onion-shaped, voluminous

Armor color: polished white / off-white / cream / ivory (variants: pale yellow, light grey, muted grey)

Helmet:

Helmet: large dome-shaped, onion-like, oversized

horizontal slit visor, small circular ventilation holes / perforations (upper section), vertical ridges / grooves, riveted metal plates

Equipment detais:

Pauldrons and shoulders: rounded, segmented, layered

Belt: deep brown / wide leather belt cinching the midsection

Under-armor: dark chainmail visible at joints, thighs, shins

Loincloth: dark, frayed, ragged cloth skirt hanging beneath chest piece

Boots: armored, heavy steel

Weapons:

Sword: long, slender straight sword / two-handed greatsword

Shield: small circular / round buckler shield, spike in the center

Tags examples:

Siegmeyer of Catarina, stout knight, bulbous onion-shaped white plate armor, dome-shaped helmet, horizontal slit visor, segmented layered plates, vertical ridges, wide leather belt, dark chainmail underneath, tattered cloth skirt, long straight greatsword, round buckler shield with central spike, rounded heavy silhouette, stoic

Notes:

1. Unfortunately, the LoRA messes up the armor and helmets of other characters (sorry, Solaire). The holes in the helmet aren't lore-accurate and are often positioned incorrectly. Sometimes a black horizontal line appears on the helmet (I don't know where it comes from).

2. If you put his helmet on other characters without the armor, it usually looks non-canonical.