Yes, that's fine. He activates Monster Reborn, targeting Blue-Eyes. You chain Call of the Haunted, targeting the same one. Just because Monster Reborn targeted it first, does not mean other cards can't target it. The chain resolves in reverse order as normal, so your Call of the Haunted resolves first, summoning the Blue-Eyes, then his Monster Reborn resolves without effect because the target is gone (he cannot select a new target).
No! You can never call off an attack once you have already declared it. The only way you can is by a card's effect.
No, not at all. When the defending player summons a monster after an attack has been declared, a 'replay' occurs. The attacking monster has to choose whether to continue its attack or discontinue it altogether and forfeit its attack that turn. If it continues the attack, it can be against a different target. If the monster was making a direct attack, and a stronger monster was summoned, then the attacker will most likely discontinue his attack. He can't continue as a direct attack, but is not forced to attack the newly summoned monster either.
Unless another card specifically denies the attack or if it was Special Summoned AFTER the Battle Phase, then yes the Special Summoned monster may attack.
They 'can' attack directly, meaning they are free to attack the opponent's monsters instead if you wish.
Jinzo's summon will be negated, its continuous effect will never be applied.
Your Dark Magician will be destroyed, his Summoned Skull will not. Neither player will take any battle damage.
No part of Call of the Haunted or Royal Decree affect a monster's ability to attack. The Sangan will be able to attack as normal.
No. Negate Attack targets an opponent's monster, it cannot be used on one you control.
No! You can never call off an attack once you have already declared it. The only way you can is by a card's effect.
No, not at all. When the defending player summons a monster after an attack has been declared, a 'replay' occurs. The attacking monster has to choose whether to continue its attack or discontinue it altogether and forfeit its attack that turn. If it continues the attack, it can be against a different target. If the monster was making a direct attack, and a stronger monster was summoned, then the attacker will most likely discontinue his attack. He can't continue as a direct attack, but is not forced to attack the newly summoned monster either.
If a potential attack target appears or disappears after the attack is declared, but before the damage step, then a 'replay' occurs. A replay is the continuation or discontinuation of the attack - the attacker is allowed to continue the attack (against a new target if it wishes, or sometimes it might have to choose a new one) or it can forfeit its attack completely for that turn. So, the opponent declares a direct attack, and you respond with CotH. CotH will resolve and summon a monster, causing a replay. The attacking monster may continue its attack, however it is not possible to perform a direct attack now, so will have to attack the newly summoned monster. Or, it can cancel its attack for that turn.
yes
Yes, a monster can attack the turn it is Normal, Flip, or Special Summoned unless it says otherwise.
Unless another card specifically denies the attack or if it was Special Summoned AFTER the Battle Phase, then yes the Special Summoned monster may attack.
They 'can' attack directly, meaning they are free to attack the opponent's monsters instead if you wish.
Yes, it has the usual toon monster effects - needs Toon World, needs tribute for a special summon, can't attack on the turn it was summoned, needs a 500LP payment to be able to attack, can attack directly if the opponent controls no toons, and is destroyed if Toon World is destroyed.
Raging Flame Sprite Has To Attack A Monster First To Attack Your Opponent Directly.