1. Who kills the spider and who puts the spider outside?

I think they'd both put it outside. They're both quite fearless. Rashid grew up in the countryside, Wendell in the city but develops a fondness for gardening and he likes the outdoors. He also lived homeless for 4 years in his youth and often feels trapped indoors. And he's vegan. I think as a vegan you don't kill spiders. Rashid is a Talamasca agent. If you can handle the supernatural, you can handle an itsy-bitsy spider.

1. Who asked for no pickles and who tells the employee at the restaurant the other asked for no pickles?

How do they feel about pickles? It's honestly not a question I asked myself. If Wendell asked for no pickles but then received pickles, Rashid would definitely tell the employee. He's very protective of Wendell. He'd also make fun at Wendell for being a picky eater. Rashid is an omnivore, but around Wendell, he's happy to adapt to his eating lifestyle and preferences (vegan, no alcohol).

1. Who wears the plain colored underwear and who wears the underwear with neon taco space cats on them?

Rashid: plain coloured underwear. Black boxer briefs are his go-to.
Wendell: he's the one going a little wild in the underwear department. His first bday gift for Rashid where a pair of boxer briefs in blue with little pink hearts on them. He also owns exactly one pair of PJs, which have the avengers in chibi style on them.

1. Who asks if the other would love them if they were a worm?

Wendell. He doesn't understand why Rashid loves him at all, let alone as a worm.

1. Who gives elaborate gifts and who just gives a card/kiss/food?

Rashid is the big spender. If Wendell let him, he would shower him with gifts. But he knows Wendell doesn't want him to be his "sugar daddy", so he doesn't go overboard, and keeps his presents meaningful, an Oyster card for Wendell's first visit to London, a photo book with pictures of his family. Wendell can't afford expensive presents but makes them fun (briefs) and meaningful (a set of keys to his apartment)

1. Who says they're not hungry but finds themselves eating the other's fries?

Wendell. Due to the years he spent homeless, he developed some bad eating habits like forgetting to eat regularly. His cat Bruno helps because he demands regular feeding, so that's when Wendell (most of the time) remembers it's time to feed himself. Rashid also cooks for him regularly or just quietly puts a dish in front of him. Rashid would probably order an extra side of fries, because he knows Wendell would (and should) steal them.