I’ve made a NPC Template but if a player wished to be a tagger, the arcane trickster could be used.

Tagger

medium humanoid (any race), any non-lawful alignment

Armor class :13 (leather armor)

Hit points: 22 (4d8+4)

Speed: 30 ft

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Str 12 (+1) Dex 14 (+2) Con 12 (+1) Int 12 (+1) Wis 10 Cha 10

Skills: athletics +3, stealth +4, streetwise +2, factions +3

Senses: passive perception 12

Languages: thieves’ cant + common

Challenge: 1/2

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Spellcasting: the tagger is a 1st level spellcaster, its spellcasting ability is intelligence (spell save DC 11, +3 to hit with spells). The tagger has the following spells prepared: Cantrips (at will): acid splash, graffiti, mage hand

1st level (two slots): alarm, expeditious retreat, illusory script

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Cunning action (PHB)

Sneak attack: +1d6

Slungshot: Melee Weapon Attack: +3 to hit, reach 5ft, one target, Hit 1d4+1 blugeonning damage

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Graffiti

(transmutation cantrip)

Casting time: 1 action

Range: touch

Components: S

Duration: 10 days

Effect: Creates a 3′ by 3′ or smaller graffiti on a wall.

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Typical Use of graffiti by gangs:

• to mark a territory as its own
• to convoke somebody
• to officialize new members
• as a warning
• to challenge/taunt rivals
• to indicate an alliance
• to mark as « under protection »
• to pay tribute to a deceased member
• to boast of an accomplishment

Crossing out a gang graffiti is a dire insult that won’t go unresponded.