Boomer

Sneaky Terrorism. He is very good at surprise attacks (+4 stealth), and if he succesfully suprises someone, the attack always hits.

Tactical Retreat. If the Boomer loses possesion of his bomb, he will throw a smoke bomb onto the ground and disappear.

Boom Bye. When the Boomer dies without having used his bomb, it drops where he dies and every creature within a 10ft radius, must succeed on a DC 15 DEX saving throw or receive 20 (4d6 +2) [explosion] damage

Boom Surprise. Melee Weapon Attack: +4 to hit, reach 10ft (blast radius), Hit: 12 (3d6 + 2) [explosion] damage. The Boomer runs up to an enemy and blows himself up, with whoever is within radius.

Boom There Aswell. Ranged Weapon Attack: +4 to hit, range 10/30 ft, Hit: 11 (2d6 + 3) [explosion] damage.

Sneak Up. Because the Boomer is so small, he can sneak up to his enemies, most often unnoticed, even during battle. If he succeeds on a DC 16 Stealth throw, he surprises whoever he targets next.