A trans man could show up as a feminist ally in many ways. Understanding that feminism as a theoretical framework challenges mass society's perceptions of women allowing their erasure from history, constant inequality, and differences in roles from their male counterparts. Not excluding the other intersecting identities that other people may have. (i.e. race, sexual orientation, etc.)
A trans man would be able to be an ally just like any other male identified person. It's by standing up when there are injustices related to one's identified gender, advocating for the change of gender discrimination (i.e. the wage gap between men and women to do the exact same job), but also not overshadowing or invalidating the woman experience.
