Lightbrush

Lightbrush is the nonbinary ship between Paintbrush and Lightbulb from the Inanimate Insanity fandom.

"Breaking the Ice"
Promptly after the season 2 cast is decided, the original cast starts to get to know the newer competitors, when Trophy eagerly says that he'll 'cream the chumps and take the million'. Lightbulb looks over to Paintbrush and whispers "Why is he saying that? Everyone knows mean characters get out first", to which Paintbrush responds with "Mm-hmm girl."

When Paintbrush wants to learn about the new cast, they wave to Microphone and say "Hi there!" Eagerly. Lightbulb smacks Paintbrush in warning and yells "Stranger danger!". After Microphone introduces herself and guesses that their names are Paintbrush and Lightbulb, Lightbulb leans over to Paintbrush and asks "Woah, how did she know that?"

"Marsh on Mars"
When the Bright Lights are facing their team elimination and the prize for being safe is revealed to be Oatmeal Raisin cookies, many on the team show disgust. However, Lightbulb claims to like them, which earns a disgusted look from Paintbrush. Later, when she is safe and eating them, Paintbrush makes another disgusted face.

After the challenge is announced, Paintbrush and Lightbulb have a quarrel after Paintbrush made a remark on how Test Tube should build their rocket, since test tubes are known to be scientific. Lightbulb shows sarcastic anger by saying 'people like you make me sick'. Paintbrush storms off and says they'll get their own tools. Once retrieving the tools, Lightbulb caves in and asks Test Tube to build a ship, and much to her surprise, she does. Paintbrush seems rejoiced and yells "See? I was right!" To which Lightbulb responds with, "This time Paintbrush, this time."

"Tri Your best"
When the Bright Lights face their 2nd elimination and Mephone hands out the prizes of sticks to Lightbulb for being safe, she begins to scarf the stick down after claiming it wasn't as good as oatmeal raisin. Paintbrush is extremely worried about her behavior, saying "Okay, that's really concerning.."

Paintbrush goes up to Lightbulb asking for help on who to pick for the challenge; the triathlon. Lightbulb picks Ying-Yang, Test tube, and Fan, who which she calls 'Paper' instead. Fan took great offense to that statement and claims that Lightbulb's simply dim-witted, to which Paintbrush backs Lightbulb up by stating that Fan is, indeed, made of paper. Lightbulb grins and says "Who was right? Me, that's who, oh snap!" And then proceeds to slap Paintbrush when she meant to give them a high-five.

"Cooking for the Grater Good"
Lightbulb and Paintbrush get into an argument during the challenge, with Lightbulb saying that Paintbrush it too judgmental and a hypocrite for judging people based on their looks, while Paintbrush says that Lightbulb never makes any sense and leads the team to disaster. Paintbrush elects themselves as the new leader and everyone in happy, but Lightbulb is rejected and sent to the Calm-Down Corner. However, she refuses and plans to make her own cookie pizza to blow the team away. She then comes back a few minutes later with a perfect chocolate cookie pizza for the team, which Paintbrush finds absolutely ridiculous.

"A Kick in the Right Direction"
After the Grand Slams' elimination, revealing Box had gotten out, Paintbrush claims that it's 'just a cardboard box'. Lightbulb wraps her arm around their shoulder and exclaims 'Painty, Tall Fella, Brush gal, don't be silly, box can be whatever it wants to be!'. Paintbrush was surprised at the sudden touch.

Paintbrush later, when they are deciding team formation on the soccer challenge, goes up to Lightbulb and apologizes and says they're thankful for her winning the last challenge. Paintbrush asks for Lightbulb to not do anything stupid this challenge, to which she replies happily and says 'they'll do it as a team.'

"Let Er' R.I.P."
In the haunted mansion, Paintbrush and Lightbulb pair up and put their differences from previous episodes aside, despite Paintbrush's stubbornness. When Paintbrush claims it's too dark in the mansion, Lightbulb turns herself on to create a 'bright light' for them, to which Paintbrush compliments her for. When Bow possesses Paintbrush's bristles, Lightbulb grabs onto them and exclaims that they're 'flying buddies', and then immediately get sent out of the mansion.

"Everything's A-OJ"
When Paintbrush is furious that no one will help them out in the next challenge due to Fan's 'pattern', Lightbulb happily volunteers to be the only one that helps out. Paintbrush thanks Lightbulb for her support, but a second after, Lightbulb gets injured and has to sit out.

"Mazed and Confused"
Lightbulb attempts to roast Mephone when he's explaining the challenge, saying that all she can hear is the 'cookies in his pocket'. Paintbrush is shown smiling at it, liking the roast themselves.

When the challenge starts, Marshmallow takes Paintbrush as her partner to go through with her in the maze. Lightbulb is seen crying about this, since she wanted to go with Paintbrush herself.

"Kick the Bucket"
Paintbrush is shown concerned when Lightbulb is reaching to put a ball of yarn in her mouth.

During the challenge, Lightbulb is out to collect water for her team's reservoir. However, she ends up getting sidetracked and finds a crab instead. Paintbrush is outraged by this, yelling at her and saying she's reached a new low of nonsensicality.

"Alternate Reality Show"
At the beginning of the episode when Mephone announces the merge, Paintbrush walks over to Lightbulb and explains how they're better off working alone now, instead of in an alliance. Lightbulb, despite not understanding, chooses to support Paintbrush. However, she's shown to be quite upset about this when Paintbrush leaves her alone.

When Lightbulb is visiting an alternate reality with Test Tube, Paintbrush is quite conflicted on how to paint, and is even quite worried when they notice Lightbulb missing. However, they try to sweep that under the rug and prove that they can work just as fine without her. However, when Lightbulb comes back, Paintbrush seems relieved and works on the challenge properly.

After Paintbrush had gotten angry at Mephone and stormed away to the Calm-Down corner, Lightbulb appears to comfort them. They talk for a little and Paintbrush apologizes to Lightbulb for blowing her off earlier. They claim that their combined skills work, and that they have 'mad skills' together. Paintbrush appreciates Lightbulb for always looking out for them and that they're usually working things independently. Lightbulb understands and says 'I got you, guy(?)', to which Paintbrush raises an eyebrow at. However, upon further thinking, Lightbulb realizes that their gender is 'None of the above', meaning Non-binary. Lightbulb supports them for their identity and comforts them with her pet crab.

When Paintbrush is voted out at the challenge's elimination, they seem to be quite disappointed but accepting of it nonetheless. However, Lightbulb catches them before they leave and gives them her crab, Baxter, as a gift to always comfort them at the hotel. Paintbrush smiles and says 'I got you', before leaving.

"Home Is Where the Heart Is"
Competing in III, the new season, Cabby and Paintbrush are plotting out ideas to kick Floor out of the competition. Cabby brings up several ideas and claim that they're not as wacky as 'Lightbulb's nonsense.'. Paintbrush seems quite offended by this claim. When Paintbrush brings up her remark later, Cabby claims that all Lightbulb ever done for Paintbrush was give them a hard time with her 'leaps in logic'. Paintbrush rebuttals that claim by saying that she also gave them the courage to start taking those leaps.

When Paintbrush is eliminated once more, they are shown saying that they'll be back with Baxter soon, before being flung off the island.

Quotes
"Oh, wow, that's really handy of you!... Uh- I mean- good job, or, whatever."

- Paintbrush (Referring to Lightbulb) in II S2 Episode 8, "Let Er' R.I.P."

Fanon
is the most popular non-binary ship in the Inanimate Insanity fandom, and is one of the most popular Lightbulb and Paintbrush ships. It is most commonly paired with ships such as Fantube, however many also prefer to ship Testbulb and Fanbrush.

On A03, has 50+ works of their ship, making it the 2nd most written ship on the site for Inaimate Insanity, and the most written ship for both Lightbulb and Paintbrush.

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Trivia

 * Many people choose to ship Lightbrush, as they are both heavily implied / canonically transgender.
 * The fandom refers to Lightbrush with the emoji variant "💡🖌️" commonly.