Can a person ron from a person that sits across or right next to him but the last tile he takes from discard pile are sequence melds? (assume all hands are closed)
Can a person call ron and the last tile he need to complete are the pair? And if this can, can it call ron from everybody or just some people who sit left to him?
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Generally yes, but it will depend on which variant you are playing and any special rules. It sounds like you are playing Japanese Mahjong (since you use the term "ron"), in which case you will need to be sure your hand has at least one yaku if you use someone else's tile to win, and obviously you can't be in a "no ten" state.
Precedence rules may also apply if two players are trying to simultaneously win off of the same discard.