Here we go.

Aya - Asexual

Ginchiyo - Straight

Garcia - Pan

Hanbei - Gay

Hanzo - Bi, no lean

Hideyoshi - Bi, fem lean

Ieyasu - Questioning

Ina - Lesbain

Kai - Bi, fem lead

Kanbei - Asexual, panromantic 

Kanetsugu - Gay

Keiji - Asexual, aromatic 

Kenshin - Asexual, demiromantic

Kotaro - Demisexal

Kunoichi - Pansexual

Magoichi - Bi, fem lean

Masamune - Gay

Masanori - Straight

Mitsuhide - Demisexal, panromantic 

Mitsunari - Gay

Motochika - Bi, masc lean

Motonari - Asexual, panromantic 

Muneshige - Straight

Nene - Bi, masc lean

Nō - Straight

Nobunaga - Pansexual, Demiromantic 

Oichi - Pansexual

Okuni - Bi, fem lean

Shingen - Questioning

Ranmaru - Demisexal

Tadakatsu - Asexual

Ujiyasu - Bi, no lean

Yoshihiro - Questioning 

Yoshimoto - Gay

Yukimura - Bi, no lean

Whoa. That a lot of ace and Demi headcanons.