Unlock the following characters by performing the corresponding tasks:
HOW TO UNLOCK
Complete Sengoku Drama Emaki as Saika Magoichi.
Complete Sengoku Drama Emaki as Sanada Yukimura.
Complete Sengoku Drama Emaki as Shimazu Otani.
Complete Sengoku Drama Emaki as Date Masamune.
Complete Sengoku Drama Emaki as Tsuruhime and Chosokabe.
Complete Oichi's Story mode once, then start again. Take the Green route and follow Tenkai when you reach Kobayakawa's stage. Kill Tenkai and complete the route. Return to any cleared character and look for a short grey alternate route near the end of one of their normal routes. Use that route and follow the grey path. Complete the Honnoji stage to unlock Nobunaga.