ou forgot some stuff but I got a lsit for you ^^
1) They have different types of sensing
Smell: The user use smell to track their prey. They smell by using their forked tongues to collect airborne particles, then passing them to the vomeronasal organ or Jacobson's organ in the mouth for examination. The fork in the tongue gives snakes a sort of directional sense of smell and taste simultaneously. They keep their tongues constantly in motion, sampling particles from the air, ground, and water, analyzing the chemicals found, and determining the presence of prey or predators in the local environment. In water-dwelling snakes (which the user also has access to), such as the anaconda, the tongue functions efficiently under water.
Eyesight: Snake vision varies greatly, from only being able to distinguish light from dark to keen eyesight, but the main trend is that their vision is adequate although not sharp, and allows them to track movements.
Infrared sensitivity: The user will have infrared-sensitive receptors in deep grooves on the snout, which allow them to "see" the radiated heat of warm-blooded prey mammals.
Vibration sensitivity: The part of the body in direct contact with the ground is very sensitive to vibration; thus, the snake can sense other animals approaching by detecting faint vibrations in the air and on the ground.
2) Their scales can be sued for defensive purpose protecting you and you could create cjs using them. The scales could also be shed so that the snakes wont take full damage (if the summon abilitiy ahs that)
3) You can create cjs that use snakes coming out of your body or having snakes being summoned which the ones out of the body are faster.
4) Snakes are Life
5) Snakes are shown to use venom in the manga and can be used on the base. To have a snake with a generic venom you gotta submit as a cj while any kind of special venom you have to be a med nin.
6) Snakes is the only other contract that allows the user to go for a Sage Mode. (wont explain it unless you go for SM)
7) You can have ones between 1 inch tall to as tall as Manda.
Any questions?