Board Thread:Questions and Answers/@comment-36665362-20180821142047/@comment-4436931-20180821235720

Dullblade wrote: There is a chapter where I think it's narrated in that Felix is male in soul or at least originally

To be fair, that part gets trimmed in the light novel, but Ferris himself never denies that he's male (he confirms that he's male whenever people who haven't met him before find out), doesn't object to others calling him male, often uses his gender to tease people, and both the WN/LN make it seem like he only crossdresses because Crusch told him to (he even lifts his skirt to show Tiriena that he's male and states that he's male in the next sentence). No characters, including Crusch, have referred to him as female except for people who don't know that he's male

Also, the author himself refers to Ferris as male, and mentions in a Q&A that he wanted to write stuff that required a crossdressing male character and blames Ootsuka for making him look cute. To me Ferris is more of a straight crossdresser than transgender

I discussed this with a transgender user once (not the quoted user) and suggested that they could try asking Tappei himself on twitter, but they refused to listen and demanded I accept the image

Just to point out, the user you're quoting doesn't follow the series and is using only that one image to support their point