I have made a way to play fire emblem with others! I have dubbed it the iron link (Ironman + Soul Link)
Standard Ironman rules (no resets, game over = new run, full deployment etc.)
Same deployed units
If a character dies in one save it dies in both
Same stats on avatar
Same S rank partners*
Same promotions/class changes
One play per DLC
*Avatar can differ if playing different genders (robinsexuals only if so)