I was just thinking. The image of Kobolds discharging flintlock arquebuses (supported by a forked rest, naturally) makes absolute sense.
I struggle to incorporate a lot of the humanoid/ demi-human races into my world, but giving Kobolds muskets and pikes (especially pikes, I know you’re grinning at the thought of it) lends the whole thing a suitably pulp aesthetic. So I did.
Hit Dice: ½ (1-4 HP)
Attacks: 1 (musket/ pike (pole arm)/ short sword)
Damage: by weapon -2*
Save as: Fighter 1
Treasure: very little (!)
*This reflects lack of competence as well as physical weakness, so should apply to missile fire as well as melee.
Pikes would be used only in larger caverns, and only in greater numbers; they’d be about 10 feet in length, requiring at least 15 feet to manoeuvre effectively; rate of fire would probably mean gunnes would be discarded after a single volley. Remember, spent muskets make wonderful clubs.
Kobolds are natural cowards, but also experience childlike glee when inflicting pain upon others. The musket appeals to the (limited) Kobold mentality since it makes a loud noise, especially in the close confines of their natural environment, can be effective at relatively safe distances, and creates a dense bank of smoke behind which the Kobold might take refuge, flee, or prepare some kind of clumsy, desperate attempt at melee.
To reflect this, Kobolds, in the round after they discharge gunnes (whether or not hits were scored), count as if in cover.