Obito Uchiha

Phases his body into a pocket dimension, and can only maintain it for a limited window before he must become solid to attack

Kamui lets attacks pass through him entirely, his primary defence

Transports himself and others into a separate pocket dimension

The Sharingan tracks movement and reads techniques as they form

He must become solid to attack, which is the stated window to hit him

Absorbs incoming attacks into the dimension rather than dodging them

Sees through the other Kamui eye held by a different user

Arrives and leaves mid-battle without any approach being detected