All credits to Queria on Civitai — https://civitai.com/user/Queria

Using the additional appearance tags in tandem with the character name seems to be needed for some characters to create a more accurate likeness

Tag count and trigger words from the source:

Cassidy: cassidy [54], beard [54], 1boy [53], solo [52], brown hair [49], cigar [41], cowboy hat [38], looking at viewer [35], smoking [34], short hair [30], mechanical arms [26], cape [25], single mechanical arm [25], muscular [24], abs [23], bara [23], red cape [22], nipples [21], large pectorals [21], poncho [20]

Mauga: muscular [48], beard [48], multicolored hair [48], black hair [48], mauga [48], dark skin [45], tattoo [45], 1boy [44], solo [43], smile [42], chest tattoo [41], large pectorals [37], headband [37], mechanical parts [29], looking at viewer [28], nipples [26], jewelry [23], grin [21]

Reinhardt: beard [56], hair slicked back [56], reinhardt [56], 1boy [54], solo [54], white hair [53], scar [52], mustache [50], scar across eye [49], mature male [44], short hair [40], muscular [37], bara[37], wrinkled skin [31], looking at viewer [30], large pectorals [30], blind [29], abs [26], nipples [24], upper body [23], navel [23], chest hair [19]

Genji (human genji): genji [24], 1boy [24], solo [24], green hair [21], forehead protector [18], scarf [16], weapon [12], sword [12], smile [11], katana [11], gloves [11], looking at viewer [11], armor [10], fingerless gloves [10], weapon on back [9], orange scarf [9]

gnj (cyborg genji): gnj [20], power armor [20], helmet [20], 1boy [19], solo [18], weapon [12], sword [10], katana [10], sheath [9], glowing [9], holding [8], holding weapon [8], simple background [6], long hair [6], sheathed [6] Hanzo: hanzo [20], beard [20], 1boy [19], solo [19], hair ribbon [18], tattoo [17], black hair [16], ponytail [15], looking at viewer [13], hadanugi dousa [11], pectorals [11], muscular [11], nipples [10], mature male [10], open kimono [9]

Greyes (Human reaper): greyes [30], beard [30], 1boy [29], solo [27], brown hair [26], short hair [25], mature male [25], mustache [23], bara [20], looking at viewer [17], scar [16], dark skin [16], hat [15], muscular [14], scar on face [14], beanie [14], hood [13], scar on cheek [12]

rpr (Reaper): mask [25], 1boy [25], hood [25], rpr [25], solo [23], trench coat [22], weapon [16], gun [15], gloves [14], upper body [14], holding [12], holding weapon [11], holding gun [11], handgun [10], bandolier [10], armor [9], ammunition [9], shotgun shell [9], black jacket [7]

s76 (Soldier 76): 1boy [29], s76 [29], solo [28], white hair [27], scar [26], scar on face [21], short hair [21], muscular [17], mask [16], jacket [14], bara [14], mouth mask [14], visor [14], large pectorals [13] jackm (Young soldier 76): 1boy [18], blonde hair [18], solo [18], jackm [18], short hair [16], blue eyes [13], looking at viewer [10], closed mouth [10], armor [10], holding [9], 3d [9], upper body [7], simple background [7], gloves [6]