|The following build is similar to Cherche - Mobile Nuke build with minor differences.
An attack boon on Frederick will give you a neutral Cherche. However unlike Cherche who is a flier and is susceptible to archer, Frederick offers 3 movements allowing ground cover. With an attack power of 52 with Death Blow with Brave Axe+. He can one-shot any blue or colourless unit when attacking first (This includes Effie).
As for Green units, Frederick can one shot most green units except these with higher defence, notably Bartre, Hector, Beruka, Michalis, Frederick and Sheena.
Given Frederick is more mobile on land; occasionally with his low res, he needs to run away from Mages. By allowing an assist skill like Pivot; it allows Frederick to create further distance from a Mage making him attack first.
For special skill, Bonfire will give Frederick 18 more attack. With 18 more attack he can one shot even more Green allies. If the user do not have enough skill points, Frederick Vanilla Skill Luna works perfectly in the need of being able to one shot opponent with high defence like Hector and above.
For his A passive, we take Death Blow because it gives the highest attack bonus and because Frederick should only be initiating.
For his B passive, Drag Back allows Frederick to move back in case a Mage is in range. Quick Riposte can help if you have Frederick to tank a hit or two, after tanking he will have his special skill Luna, Bonfire activated. Additionally, Pass can work on Frederick if a user wants to bypass and attack the Mage first with his high might.
For his C passive, Threaten Attack is used if Frederick is needed to tank a certain hit. Threaten Defense allows Frederick to attack even harder.