Siege weapons are in:
Edelgard starts with 13 strength and relatively high charm as well, hence having 24 in them at level 17. What's more interesting is that you can have two weapons equipped and there is a separate slot for tomes. Some of the abilities are passives, some active or command-based. The skills on the right are prerequisites for class changing (eg bow knight needs riding, lances and bows at a given proficiency).
The level-up screen. Charm (CHA) buffs the attached "battalion" that can attack via the Gambit system. It's a special attack in practice, although visually it's reminiscent of a mosou game.
There area lot of JRPG-style quests at the academy. Fans of JRPGs like Persona will feel at home, since the calendar and time management aspects are used here.
Combat arts lower weapon durability faster, but give significant bonuses.
An early map on the Black Eagles route. "Defeat boss" is quite a common objective in 3 Houses. Although the map is rather chokepoint-heavy, terrain height does seem to have some effect on combat.
Byleth after reclassing to mercenary. Skill experience works like weapon level from previous Fire Emblems. Healing items can still be stacked, and bows can have increased range on par with Gaiden/Echoes (some of this is from abilities).
Enemy armour knight with a unique weapon that confers a magic-style ability.
A mostly straightforward two-front map. You also need to keep the enemies out of the town area you start in, because that triggers a failure condition after a few turns.
Keeping the green units alive is a bonus objective here. The split deployment zones force you to move quickly to the river to save them.
Combat forecast:
This is an indoor map with what appear to be warp tiles. Cavalry can stay mounted indoors, but have less in the speed stat to offset this. Pegasi have 1 less move than cavaliers.
Branching path on the Black Eagle route. If I recall correctly, staying put will mean you side with the Church of Seiros over Edelgard, and prevents you recruiting a certain enemy unit.
This weapon synergizes with the named crest to increase health regeneration (there are many crests in the game that have different effects when equipped).
Some skills from Fire Emblem Heroes make an appearance, such as Desperation.
You can cross the water on this map, apart from a few ocean tiles.
Byleth masters the mercenary class by learning all related abilities.
This is the guy you can recruit if you side against the church:
Byleth's father joins him\her in combat here, and there are a few civilians to protect. Not sure what the reward is for keeping all of them alive, but Jeralt will comment on it after the battle.
The last map before the 5 year time skip (after which the houses are at war).