QIf this crest is the only card in my EX area when I play Shiki Ichinose's On Evolve ability, does my leader take damage?

ANo. Crests do not have a cost.

QIf I have this crest in my EX area, can I use Hamelin's Fanfare ability to put a token of the same name into my EX area?

ANo. Each player can only have 1 copy of a crest with the same name in their EX area.

QIf I have this crest and a Fairy Wisp in my EX area when I play Optimistic Beastmaster's activated ability, how much damage does it deal?

AIt would deal 1 damage.

QDo crests count as 0-cost cards for abilities that specify cards with different costs, such as Lucille, Keeper of Relics?

ANo. Crests do not have a cost.

QCan crests in the EX area be selected by abilities that select cards?

AYes, they can.

QCan crests in the EX area be banished or transformed?

AYes, they can.