Here is the jutsu. Analyze each of the gates, their power and drawbacks.
Hachimon ) The Eight Inner Gates
Type: Supplementary
Rank: N/A
Range: Short
Chakra: N/A
Damage: N/A
Description: The Eight Gates are eight specific points on a person's Chakra Pathway System. They limit the overall flow of chakra within a person's body. The basis for the idea of the chakra gates comes from the body's limits on the functions within it. This makes the body much weaker, but it keeps the body from expiring too soon. By undergoing intense training, one can learn how to open these gates allowing the user to surpass their own physical limits at the cost of extreme damage to their own body. The user opens the gates in sequence, up to the desired gate to achieve its effects. Opening the gates is a fast process and can be done in mere moments up to the desired gate. EIG Masters can do so easily and in a passive way (not spending a move). When one opens up to a given EIG, that opening lasts 4 turns. Opening additional gates upon the last turn of the active opening adds 2 turns. However, there is an exception. Opening the last and 8th gate can only be done for 2 turns, even if the user opens it immediately.
(Kaimon) - The Gate of Opening: The user activates The Gate of Opening or First Gate, which is located in the brain. This gate removes the restraints of the brain on the muscles so he can begin to access 100% of their strength. Unlocking this gate allows the user to use the Front Lotus. This gate adds +5 damage to Taijutsu and the user becomes 1.5x faster. This gate also adds +10 chakra and damage to Ninjutsu. User suffers -5 damage per turn.
(Kyūmon) - The Gate of Healing: The user activates the Gate of Healing or 2nd Gate (also named Rest Gate) which is located in the brain. Forcibly increases one's physical strength and temporarily re-energizes the body. This gate adds +10 damage to Taijutsu and the user becomes 2x faster. This gate also adds +10 chakra and damage to Ninjutsu. User suffers -10 damage.
(Seimon) - The Gate of Life: The user activates the Gate of Life or 3rd Gate which is located in the Spinal cord. The increased blood flow turns the skin red. Allows the user to use Hidden Lotus. This gate adds +15 damage to Taijutsu and the user becomes 2.5x faster. This gate also adds +10 chakra and damage to Ninjutsu. User suffers -15 damage.
(Shōmon) - The Gate of Pain: The user activates the Gate of Pain or 4th Gate (also named Wound Gate) which is located in the Spinal cord, lower than the Seimon. Increases the user's strength and speed. May cause muscle tissue to begin to tear on use. This gate adds +20 damage to Taijutsu and the user becomes 3x faster. This gate also adds +15 chakra and damage to Ninjutsu. User suffers -15 damage.
(Tomon) - The Gate of Limit: The user activates the Gate of Limit or 5th gate, which is located in the abdomen. Increases the user's speed and power. This gate adds +30 damage to Taijutsu and the user becomes 3.5x faster. This gate also adds +15 chakra and damage to Ninjutsu. User suffers -15 damage.
(Keimon) - Gate of View: The user activates the Gate of View or 6th Gate, located in the stomach. Increases the user's speed and power. Opening of this gate releases such enormous amounts of chakra that it can cause nearby water bodies to form a vortex around the user. Allows the user to perform the Morning Peacock. This gate adds +40 damage to Taijutsu and the user becomes 4x faster. This gate also adds +15 chakra and damage to Ninjutsu. User suffers -25 damage.
(Kyōmon) - The Gate of Wonder: The user activates the Gate of Wonder or 7th Gate which is located below the stomach. Those who open this gate will pour glowing green sweat from every inch of their body, which immediately evaporates from their own heat energy, creating an aura which people would mistake as a green chakra coating. However, the side effects of opening the gate are that the user's muscle fibers are ripped to shreds after exiting this gate, causing intense pain if anything or anyone touches him. Allows the user to perform the Daytime Tiger without great strain on the user's chakra. This gate adds +60 damage to Taijutsu and the user becomes 7x faster. This gate also adds +20 chakra and damage to Ninjutsu. User suffers -40 damage.
(Shimon) - The Gate of Death: The user activates the Gate of Death or 8th Gate, located at the heart, requiring the user to puncture their chest just above the heart in order to open it, enabling the user to achieve what is described as The Eight Gates Released Formation" ( Hachimon Tonkō no Jin ). Opening this gate will cause the user's blood to emanate a flaming aura of red steam, the so-called Steam of Blood ( Chi no Jōki ) from all pores of their body, hair, and eyebrows. Releasing this gate uses up all of the body's energy while making the heart pump at maximum power. Exceeding the power of every other gate, the user is temporarily granted approximately a hundred times their normal power, far beyond that of the five Kage. Once activated, those who are capable can perform the Evening Elephant and the Night Guy. The side effect of opening this gate is that it comes at the expense of the user's life, causing the user to crumble to ash after their chakra runs out, having virtually cooked themselves from the inside-out. This is unlike opening the other gates, which simply injure or damage the body. This gate adds +120 damage to Taijutsu and the user becomes 8x faster and allows the user to warp space with his speed.
Note: The EIG users can only open the gates twice per fight, meaning that if he allows the EIG opening to time out, he can only open the EIGs once more during the match. EIG Masters can open EIGs three per battle if the first two uses are only up to 5th gate
Note: Starting with the fourth gate, EIG users begin to feel the side effects of each gate as they time out. EIG Masters don't suffer damage from opening up to 6th Gate, being left unable to move correctly for 2 turns and unable to mold chakra above S rank in the next turn. EIG Masters will feel the side effects for opening 7th Gate and up.
Note: The user cannot use other self powering techniques (such as custom variations of Lightning Armor, Sage Mode, etc) while he has EIG opened
Note: Opening the 8th Gate kills the user at the end of the 2 turns it remains opened.