S.I.H. is right! That's why I am puting the "Genderless" category for characters like Ultralinks.
On the other hand, if Steel eats Max's T.U.R.B.O. Energy, the other Ultralinks probably feed off from the hosts' vital energy? I can't figure out how they would do with other non-living beings such as rocks and bones, but I guess that Makino must feed them.