No. It is an Ignition Effect, meaning you may only activate Snipe Hunter's effect during your turn.
Yes, it is a Quick Effect and can be activated in either player's turn.
No, Alector has no effects that can be used in the opponent's turn. His summon effect is something that can only be done in your main phases, and his negation effect is an Ignition Effect so again, can only be done in your turn.
As Destiny Hero - Plasma's equip effect is a "Once Per Turn" effect, yes it can, and the existing monster is destroyed.
You can only do so if a card effect specifically lets you, like Call of the Haunted. Otherwise, regular Special Summons, Synchro, Fusions, XYZ's, etc, all must be done on your turn in your own main phases.
yes
yes it would, because when the opponent attacked, it was his turn and the effect carries on until the end of the next turn which would then be your turn. For e.g, if your opponent activated the effect then the effect would end at the end of your end phase. If you activated the effect, then it would end at the end of your opponents end phase.
No. It is an Ignition Effect, meaning you may only activate Snipe Hunter's effect during your turn.
Yes, it is a Quick Effect and can be activated in either player's turn.
No, Alector has no effects that can be used in the opponent's turn. His summon effect is something that can only be done in your main phases, and his negation effect is an Ignition Effect so again, can only be done in your turn.
If you mean for its own effect, then no. It is an Ignition Effect so can only be activated in your own main phases.
Depends what for. You could tribute it for a spell speed 2 or 3 effect such as Enemy Controller, but not for an Ignition Effect.
Unless specifically stated otherwise, by either directly saying so, or the effect is spell speed 2, then a special summon can only be performed in your own turn. Megarock Dragon can only be special summoned by its own effect in your own turn.
Of course not Why would someone chain a card that ends the opponents turn with another one that has the same effect
As Destiny Hero - Plasma's equip effect is a "Once Per Turn" effect, yes it can, and the existing monster is destroyed.
it is now your opponents turn
No