No, [Koji Minamoto] digivolves as a Tamer.

No, they don’t trigger. "When a Digimon digivolves" effects don't trigger when a Tamer digivolves.

No, they don’t trigger. "When a Digimon digivolves" effects don't trigger when a Tamer digivolves.

Yes, you can. Because you're digivolving from a Tamer, it isn't considered an unsuspended Digimon.

No, you can't. P-104 [Mental Training]'s <Delay> effect digivolves 1 Digimon. It doesn't digivolve Tamers.

No, this card's [When Attacking] effect does not allow ignoring digivolution requirements, so you can only digivolve into a card that meets the digivolution requirements.

They trigger simultaneously, so the turn player chooses the effect to activate first. However, if you activate the 2nd [When Attacking] effect first and digivolve, the 1st [When Attacking] can no longer be activated.

No, you can't. For this card's 1st effect, you declare a digivolution, then upon revealing this card, you can also choose a Tamer as the card to digivolve, and that Tamer is also treated as a level 3 Digimon. As with the normal digivolution procedure, after revealing this card and declaring a digivolution, you can't choose to not digivolve. In addition, you can't declare digivolution into this card in the first place unless there is a card on the field that you can digivolve.