Yin-Yang/Relationships

Each Other
Both of them have fought numerous times throughout the series.

Status: Enemies

MePhone4
Just like all the eliminated contestants before EP 7, Yin-Yang probably despises him.

Status: Enemies

Paintbrush
Yin-Yang and Paintbrush have a very rocky relationship. While shown to not mind each other at times, The two get into fights and arguments due to Yang's stubbornness and Paintbrush's temper.

Status: Bad Terms

Marshmallow
Marshmallow and Yin-Yang have a bad relationship. Marshmallow went up to Yang and told him to sit at the Calm-down Corner, and then Yang hit her. They've never interacted since. Yang was even happy about Marshmallow's falsely assumed death.

Status: Enemies (Yang only)

Tissues
As of the Inanimate Insanity II T-Shirt Anniversary, they seem to be on good terms. Tissues never disagreed with or interrupted Yin or Yang in the advertisement. Yin even kindly asked Tissues to be in the ad and he accepted. However, Yang did get violent with Tissues in the middle of it. But, at the end of the day, they seem to be on good terms with each other.

Status: Friends

Knife
Knife obviously despises Yang for what he did in episode 3, but on Yang's side, however, He doesn't really see him as an enemy, he just sees him as expendable.

Status: Neutral 

The Cherries
With the exceptions of episode 2 and some possible off-screen interactions with them before episode 7, They never really interacted. they might be enemies though because of Yang punching them into the portal, but in the 3rd Inanimate Insanity Comic, they seemed to be in good terms.

Status: Friends

Soap
They probably weren't friends from the start of the series, in the first challenge Yin-Yang unintentionally hit her off the glacier, then in episode 5, she called them cute, so they might be in a good relationship.

Status: Possibly Friends