Marik is also not bad, but you need to plan the slaughter very carefully. That is, prepare to slaughter all the offspring with lochs in 1 day (121 sure). Or as an alternative, start slaughtering slowly as early as the 1st week, even if it comes at a cost to the building pace.
But Fiona looks a bit weak here — her army is more oriented toward battles in the open field rather than in "cans" with fast-moving creatures. The lack of armor and offense also weighs her down; raw power on Jebus Cross is more useful than any speed/flexibility.