How does this card's [Start of Your Main Phase] effect treat this Tamer as a Digimon?
This Tamer will be able to attack in the same way as a Digimon, and will also receive effects that target Digimon. It will also be deleted in battles with Digimon or Security Digimon.
If the DP of this card, which is treated as a Digimon due to the [Start of Your Main Phase] effect, is reduced to 0 by an opponent's effect, will it be deleted?
Yes, it will be deleted.
When this card, treated as a Digimon due to the [Start of Your Main Phase] effect, is suspended, this card's [Your Turn] effect of "When this tamer is suspended" activate because it's currently a Digimon?
Yes, When this card's [Start of Your Main Phase] activates, this card is treated as both a Digimon and a Tamer, so when it is suspended, it is considered to meet the conditions "When this Tamer is suspended".
If this card, which is treated as a Digimon due to the [Start of Your Main Phase] effect, is chosen for the effect of "Place 1 Digimon as a digivolution card of another Digimon". Does that count as "digivolving from this Digimon"?
No, it does not. The effect of this card is only treated as a "Digimon", and when it is placed in the evolution source of another Digimon, it is treated as a Tamer card and the [Start of Your Main Phase] effect that was activated is lost.
