Bugbear Werebear

Brute. A melee weapon deals one extra die of its damage when the bugbear hits with it (included in the attack).

Surprise Attack. If the bugbear surprises a creature and hits it with an attack during the first round of combat, the target takes an extra 7 (2d6) damage from the attack.

Shapechanger.  The werebear can use its action to polymorph into a Large bear-humanoid hybrid or into a Large bear, or back into its true form, which is humanoid. Its statistics, other than its size and AC, are the same in each form. Any equipment it is wearing or carrying isn't transformed. It reverts to its true form if it dies.

Keen Smell. The werebear has advantage on Wisdom (Perception) checks that rely on smell.

Multiattack In Bear form, the werebear makes two claw attacks. In humanoid form, it makes two morningstar attacks. In hybrid form, it can attack like a bear or a humanoid.

Morningstar. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d8 + 4) piercing damage. 

Bite (Bear or Hybrid Form Only). Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 15 (2d10 + 4) piercing damage. If the target is humanoid, it must succeed in a DC 14 Constitution saving throw or be cursed with werebear lycanthropy.

Claw (Bear or Hybrid Form Only). Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) slashing damage. If the target is humanoid, it must succeed in a DC 12 Constitution saving throw or be cursed with werebear lycanthropy.