Zombie: Walker Zombie ( Nickname: Walker/s. )

Speed ( Running ): 2 mph 

Speed ( Walking ): 1 mph

Virus: Corpuset Tarda ( Dead and slowly )

Stages: 

Phase 1: Slightly faster than other phases, the skin around mouth falls off/scrapes off, shake violently at times, eyes turn dull.( Start of the apocalypse )

Phase 2: Slow, motor functions slow down, reaction time is slower, skin starts to fall off. ( 2-3 weeks after the start of the apocalypse )

Phase 3: Skin decays, very slow motor functions, reaction time slows down, loss of visual tracking, start walking sideways. ( 1-2 months after the start of the apocalypse )

Phase 4: Not able to move legs, have to crawl. Skin completely decays, reaction time slows down by 15 seconds, unable to use feet and hands. ( 3-5 months after the start of the apocalypse )

Phase 5: Some become deceased, others stay at Phase 3 or 4. ( 1 year after the start of the apocalypse )

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Zombie: Runner Zombie ( Nickname: Runner/s )

Speed ( Running ): 16 mph

Speed ( Walking ): 4 mph

Virus: Corpuset Currax ( Dead and rapid )

Stages:

Phase 1: Very fast, look human-like, eyes turn red, have more intelligence than walkers. Person's consciousness is still there, but the virus controls every action. ( Start of the apocalypse )

Phase 2: Become lanky, all hair on the body comes off, eyes turn black, prefer to attack at night. Arms become elongated, can jump off walls ( Not stick ), bones protrude through the body. ( 4-5 months after the start of the apocalypse ) ( Earliest  sighting recorded 1-2 weeks after the start of the apocalypse )

Phase 3: Acute eyesight, can replicate voices, leap higher in the air, become bigger, if bitten you will turn into a new zombie. Hiss and snarl as a way of communication, attack anything on sight. ( Including walkers and runners ) ( 5-10 years after the start of the apocalypse ) 

Phase 4: Virus gives most control to the human but still controls them, the creature no longer has control to speak or change expressions. Acts like a Phase 3 runner would. Very intelligent, can create death traps and distractions WITHIN REASON. ( 20-30 years after the start of the apocalypse )

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Zombie: Killer Zombie

Speed ( Running ): 15.9 mph

Speed ( Walking ): 3mph

Virus: Unknown. Most likely a strain of Corpuset Currax. ( Zombie turns after a bite from a Phase 3/4 runner )

Stages:

Phase 1: Acts, looks, does, reacts exactly as a human would. Sole intention is to kill off every person in sight/create more killer zombies. Use weapons to hurt and kill other humans. Person has no control over body, but can sometimes break through for a couple of seconds before they go back into rage mode. ( 5-10 years after the start of the apocalypse )

NOTE: Can be killed just by blood loss and wounds. 

NOTE #2: Do not trust someone after they get bit by a Phase 3 runner. The process can happen in as little as a few seconds-minutes, longest it can go to is minutes-hour.