Marina is a friendly mermaid doll, and can knitted with a combination of just four stitches: knit, purl, a kfb increase and a k2tog decrease. Designed by Amanda Berry @fluffandfuzz, the doll is knitted in acrylic DK yarns on single pointed needles (not in the round).  The bikini strap is a single crochet chain worked on a crochet hook.

Find the knitting pattern at LoveCrafts.