Growth & Cline are new characters introduced in Metal Slug Attack.
The two are mercenaries hired by the Rebel Army. Cline is the smaller woman, while Growth is the larger, muscular one. Cline has a rather energetic personality, while Growth is completely silent. Despite their glaring differences, they are good friends and Cline is the only one who understands Growth. They can be easily distinguished in the battlefield with their signature red berets.
Cline uses shortswords and her speed to overpower enemies, while Growth's massive strength allows her to carry Bull Chans with her bare hands and toss them at the enemy. The two are notorious for causing friendly-fire incidents, though it is more likely to be a rumor. Growth also appears to have some ninja training, since she appears out of nowhere to support Cline with a Bull Chan and also extract her if the battlefield becomes too dangerous.
First appearing in the Extra Ops "United Front the 14th", the pair are called in to assist the Rebel Army in an operation against the Ptolemaic Army. Their appearance quickly intimidates the Rebel soldiers due to rumors of them causing friendly-fire incidents. Cline is annoyed that their allies are calling them monsters, while Growth feels that they are right. Cline reassures Growth and the two give it their all so they can return home.
After the battle, the pair seem to have developed a crush on two members of the Ptolemaic Army - Cline likes Damian due to his mysteriousness, while Growth likes Owen due to his alluring tolerance. They then use their remaining coins to buy an avatar icon after a short discussion about the two men.
- Both characters bear a resemblance to the Delta Red special forces from the Street Fighter series.