Ok so far in the anime and manga there has only been 2 people shown to utilize the Spider contract; Kidōmaru and
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.
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is the most popularly known signer having faced Neji in the Chuunin Exams Arc with his infamous Spider summoning
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which had a myriad of ninjutsu tied to it as well. He was later Edo Tensei'd in the World War and summoned the same spider only to be defeated by Neji and his Gentle Fist again. Suika on the other hand appears to be some bandit fodder whom the genin team Kurenai had the displeasure of facing, he had ninjutsu techniques related to the Spider contract such as
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which used chakra enhanced webs to trap victims while the user destroys them. From what I've seen it doesn't require a tattoo yes, as with seen with other animals such as Hawk and Toad and a few others but I would like a tattoo thank you very much, as long as I don't break canon rules. The users of this contract have been shown to be able to produce the idiosyncratic ability of spiders; webs as well as an uncanny '6th sense' when it comes to fighting hidden opponents.
I've wanted Spider contract ever since I watched Kidōmaru go full level 2 curse mark and had the near spider like characteristics, as well as that huge Spider summoning. It sparked my interest, then coming into the NB RP I would have imagined it would be available like Toads and Snakes but its only up til now that I am given the chance to sign the contract. I plan to utilize this contract in many ways, namely using the broad variety of spiders that exist in the natural world with each their own unique ability and adding them to specific summonings. Ninjutsu wise you can expect some level of webbing to be involved although I'm not sure just how far I would be able to bring this. Submission time I'll find out.