If the player who set NIRA-CHAN (Hippocampal Pain) is the priority player, does the effect of the character card their opponent set take effect?
A
No, it doesn't. The character cards are swapped by NIRA-CHAN (Hippocampal Pain) before the opponent's effects are resolved, so the opponent can't use the effect of the character card they newly set that turn.
Can effects like Summer UNIGURI and the friends's "If the cards in the abyss are only ○ element…" be used when there are 0 cards in the abyss?
A
No, they can't. Resolve them on the basis that there are cards in the abyss. Likewise, effects like Last resort's "If the cards in the power charger are only ○ element" are resolved on the basis that there are cards in that zone.
No, it can't. Enchant cards are put in the abyss or power charger at the end of the turn depending on whether they have SEND TO POWER. So an enchant card set this turn goes to the abyss at the end of the turn, and can't be chosen with Kitte-men • Inc-neko (Seigi). However, if a different enchant card was already in the abyss from an earlier turn, you can choose it with Kitte-men • Inc-neko (Seigi), and together with the card in the set zone, use that enchant card's effect twice.
No. For "choose up to ○" and "choose ○", you must choose when there are valid targets. Where you can choose how many, always choose at least 1. (With The last dance at the ball (SHADE), choose 1 or 2.) If there are no valid targets, finish resolving without choosing. If the rest of the effect can't take effect without a target, it finishes resolving without taking effect.
With a (SHADE) character card in my battle zone and Searching ! in set zone C, I set a character card that isn't (SHADE) while preparing for the turn. This turn, can I use the effect of a (SHADE) character card in my power charger with Searching !'s effect?
A
Yes, you can. If you swapped out a (SHADE) character this turn, Searching !'s effect can take effect even if the character card put in the battle zone by the swap isn't a (SHADE) character card.
With a (SHADE) character card in my battle zone and Searching ! in set zone C, I set a (SHADE) character card while preparing for the turn. If my opponent is the priority player and set NIRA-CHAN (Hippocampal Pain), does Searching !'s effect take effect?
A
Yes, it does. The fact that you swapped in a (SHADE) character card that turn remains, so Searching !'s effect can use the effect of a (SHADE) character card in your power charger.
I ended a turn with power cost 4 in my power charger, KAITO-INC-NEKO (SHADE) in my battle zone and Searching ! in set zone C. Next turn I set NIRA-CHAN (SHADE) and swapped characters. The power cost of the character in my battle zone isn't met, but can Searching !'s effect take effect?
A
Yes, it can. In this case the condition of the effect of the (SHADE) character card Searching ! can choose ("If you swapped in a (SHADE) character this turn") is met, so the effect of the card chosen with Searching ! can take effect.
Is the condition "If you swapped in a (SHADE) character this turn" on (SHADE) characters' effects met when they're swapped by my opponent's NIRA-CHAN (Hippocampal Pain)?
A
No, the condition isn't met in that case. "If you swapped in a (SHADE) character this turn" means when you did the swap yourself. So even if your character card was swapped by NIRA-CHAN (Hippocampal Pain), effects with the condition "If you swapped in a (SHADE) character this turn" can't take effect unless you swapped in a (SHADE) character yourself this turn.
When using Patchwork notes, can I choose not to reveal my hand?
A
No, you can't choose not to reveal your hand. You can't choose not to use an effect that can take effect (its power cost is met and its conditions are met), so while its power cost is met you have to reveal your hand, even if you don't have 4 or more elements in your hand or don't want to reveal it.
With NIRA-CHAN (STUDY ME)'s "You may choose 1 (STUDY ME) character in your hand and put it in your power charger", does the power of the card put in the power charger count straight away?
With no character card in my battle zone, I set a character card and Moon reflected on the water at the same time. Can I choose not to put that character card in the battle zone?
A
Yes. If Moon reflected on the water's POWER COST is met, you can choose not to put the character card in the battle zone, even on a turn you set Moon reflected on the water and a character card with no character card in your battle zone.
Moon reflected on the water's effect takes effect at the character swap step. So it isn't affected by effects that take effect later, at the character/enchant/area enchant effects step.