1 EARTH Tuner + 1 or more non-Tuner monstersWhen this card destroys an opponent's monster by battle and sends it to the Graveyard: You can Special Summon that monster to your field in Defense Position.
1 Fiend-Type Tuner + 1 or more non-Tuner monstersWhen this card destroys an opponent's monster by battle and sends it to the Graveyard: You can have this card gain 800 ATK until the end of the Battle Phase, also this card can make a second attack in a row.
1 DARK Tuner + 1 non-Tuner Insect-Type monsterThis card cannot be destroyed by battle. When this card declares an attack, if the ATK of the attack target is higher than this card: The ATK of the attack target becomes equal to this face-up card's current ATK. This change lasts until the end of the Battle Phase. When this card destroys an opponent's monster by battle and sends it to the Graveyard: Send the top 3 cards of your opponent's Deck to the Graveyard.
Cannot be Normal Summoned/Set. Must be Special Summoned (from your hand) by sending 3 other monsters from your hand to the Graveyard, and cannot be Special Summoned by other ways. This card's ATK becomes the combined original Levels of the sent monsters x 300.
When this card is destroyed by battle with an attacking monster your opponent controls and is sent to the Graveyard, you can equip this card to that monster. The equipped monster loses 1800 ATK. When it is destroyed and this card is sent to the Graveyard, you can Special Summon this card.
They likely are. 5D's does seem to take place in the main continuity (not outright confirmed unless you count Bonds Beyond Time I suppose), just like 20 or so years after GX. There's a few references here and there. (Kaibacorp's a thing, and there's a mention of Pegasus's death, given a Memorial thing.)
I could see him getting a lot of the Goyo stuff as level rewards, most of which isn't terrible. (Chaser and Predator would be quite nice.) Probably at least 1 copy of Wiretap, too, which is also quite a good card.
Pretty sure Goyo Guardian is going to be just like the other skills, in which it will be part of your extra deck along with 2x Jutte Fighter if you are using the skill, other wise the Jutte Fighters are not able to be collected and Goyo Guardian is part of some mini-box.