Str: 45% Lck: 15%
Mag: 20% Def: 45%
Dex: 45% Res: 10%
Spd: 30% Cha: 35%
Strengths: Lance, Axe, Heavy Armor, Riding
Personal Skill: Veteran Knight: Unit takes 2 less damage while in formation with a battalion.
Black/Dark Magic Learn List:
- Thunder: D
- Thoron: C
- Heal: D
- Nosferatu: D+
- Ward: C
- C+: Shatter Slash: +4 Mt, +10 Hit, 1 range, costs 3 durability. After combat, inflicts Def -5 on foe for 1 turn.
- A: Glowing Ember: +2 Mt, 1 range, costs 4 durability. Avoid +10. Might increases based on user's Defense.
- C+: Spike: +5 Mt, +15 Hit, +10 Crit, 1 range, costs 5 durability.
- D: Rally Defense: Use Rally to grant Def +4 to an ally.
- C: Battalion Wrath: If foe initiates combat while unit's battalion endurance is ≤ 1/3, grants Crit +50.
The fact that Gilbert gets stuck with being a fortress knight for his auto-leveling completely removes any chance you have of making him someone that can use any weapon besides gauntlets and maybe axes. For a whopping 20+ levels, his effective Spd growth will be 0%—for reasons known only to the dev team, auto-leveling uses the enemy versions of classes, which have far more extreme stat growth modifiers. Enemy Fortress Knight, in particular, has a -30% Spd growth modifier, tanking Gilbert down to 0%, ruining any chance he has of ever not being doubled by anyone. Sure, he'll have lots of HP and Def, but even on Maddening, a unit does not need a lot of HP and Def to be able to survive the enemy phase.
Adding insult to injury is that Gilbert being limited to the last half of the game means that, even if you wanted to train him into a gauntlet user, you have to play shitloads of catch-up with him, demoting him to a brigand so he can get Death Blow, and then training him in gauntlets, which he does not have a strength in, unlike every other character with similar growths (Balthus, Raphael, Dedue, arguably Caspar). Oh, and the entire time you're doing this, you have to contend with the fact that, because Gilbert is not a student character, he's susceptible to getting one-stat levels.
The most I can say for Gilbert is that he's one of two units most suited to being a great knight—only Ferdinand also has strengths in Axe, Heavy Armor, and Riding all at once—even then, you'd need to unlock his aptitude for Heavy Armor to get the strength for it. This is damning with faint praise, however, because Great Knight is an abysmal class, and making a unit into a great knight is not something you should aspire to do.
Oh, and for the final insult, Gilbert's support list is abysmal. He supports nine other units, including Byleth. However, he only goes up to A ranks with three of them—Annette, Dimitri, and Byleth. His support with Annette is also Mt-boosting, but good luck taking advantage of that, given that Annette has her own severe problems with being used for actual combat.
You'd have to be really godsdamned desperate to use Gilbert, in my opinion. "I can't field a full group of units for this map without Gilbert" desperate. I guess it is worth noting that if you do a Blue Lions no-recruitment run, you literally can't field a full group for the final maps without him, so that's a...good thing for him?
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