Heero Yuy/Relationship

Heero Yuy had many Relationship.

Canon(Crossover)
Hanasaki Tsubomi/Cure Blossom

Heero/Wing Gundam/Wing Gundam Zero/Wing Gundam Zero(EW Ver.) had relationship with Tsubomi/Cure Blossom, he know she is NOT Cowardly.

Dune

Dune is Heero/Wing Gundam/Wing Gundam Zero/Wing Gundam Zero(EW Ver.)'s rival, in Cross Maximum 2: Exceed Sky, Dune is now evil to good, be a friend with Heero/Wing Gundam Zero/Wing Gundam Zero(EW Ver.)

(Note, Dune & Heero had same voice actor)

Setsuna F. Seiei/Gundam Exia/00 Raiser/00 Qan[T]

in Cross Maximum, Similar like Super Robot Wars Z2.

in Cross Maximum 2: Exceed Sky, Similar like Super Robot Wars Z2.