You will find both of these followers in the Drunken Huntsman. They are both around a level 20-25, one of them has some buffs to her stats, Dwarven armour and Daedric daggers. The armor in the pisc is from "Remodeled Armor for CBBEv3 Bodyslide and BBP" by ChronoTrigger77, you should use it...its sweet! You can find it at the address below. Thanks for checking out my mod. Hopefully I will get better as I learn.

http://skyrim.nexusmods.com/mods/25259/

No mods required. Stand alone followers.

Mehri Jayne likes to use her one-handed weapons though she is proficient with a bow. She leaves the ranged weapons to her sister who is an expert archer.