• sm: ami/mako, haruka/michiru, minako/rei, chibiusa/hotaru
• fe1/3/11/12: minerva/palla, julian/lena, elice/nyna
• fe2/15: celica/mae, faye/silque, leon/valbar
• fe6/7: lucius/raven, florina/lyn, guinivere/melady, eliwood/hector
• fe8: eirika/l'arachel, marisa/tana, joshua/natasha
• fe9/10: reyson/tibarn, elincia/lucia, nailah/rafiel, oscar/kieran, heather/nephenee
• fe13: lissa/maribelle, sully/sumia, say'ri/tiki, noire/severa, chrom/robin
• fe14: hana/sakura
• fe16: hilda/marianne, ferdinand/hubert, catherine/shamir, dorothea/petra, ignatz/raphael, caspar/linhardt, ashe/dedue
• akayona: hak/yona, lili/yona, jae-ha/kija
• misc: miles/phoenix, falin/marcille, primrose/h'aanit, cyborg/starfire, aya/razer, ed/winry, aki/yugo, sokka/zuko, camilla scarlet/rosie mayfield, adora/glimmer, rosch/stocke

(among many others these are just the big 'uns)