Vandal Hearts on PS1. I think its probably not as good as I remember, but I was a small child and it said the word "Bastard" and that was the most adult media I'd been (unknowingly) allowed to consume. I played that game hard.

Tactical RPG's are my favorite genre of games, and Tactics Ogre (not Ogre Battle) in any of it's many iterations is my favorite. No game is perfect but it does so many things so, so well. Matsuno's magnum opus. The latest version, Tactics Ogre Reborn added high quality voice acting which I really love.

Wildermyth was very enjoyable, it's not as deep and well written as some of the others mentioned but still held my attention long enough to finish it.

Pretty unique art style and it felt relatively challenging throughout.

The only game that I've ever played like this is SNES' game Ball Bullet Gun, it was like 12 yeas ago. It doesn't have a story. You make your team, and play against another player. Playing it alone is kinda boring.

My favorite series is disgaea, but I wouldn't recommend it to most people, it's over the top game breaking silliness.

Chroma-squad is often overlooked, but captures a lot of what name 90s trpg's great and improves on the formula quite a bit.

The absolute best trpg imo is "bionic dues", I feel like it you enjoyed into the breach you should definitely give bionic dues a shot, it's such a different style of game,

I lamy FF Tactics a little bit. And it was okay (I was pretty young) but when advanced ears came out. Hooooo my god k was hooked. I was always on my Gameboy every chance I could get.

Shining Force is a classic. Basically Seva's answer to Fire Emblem.

Wargroove is pretty good too. Kind of like Advance Wars, but in a more medieval fantasy setting. From an indie dev with pixel art. My only real complaint is one I have with all modern "retro pixel art" style games: the "pixels" can move by much smaller increments than themselves. I wish games that used that style would align everything, including animation, to the fake pixels. It looks kind of busy and messy imo. It doesn't bother me enough to ruin Wargroove though.

Banner Saga was pretty good. It's a combination of tactical RPG with mostly text-based choose-your-own-adventure style elements between battles. Still haven't played the 3rd one, but I enjoyed the first 2.

Wasteland 3 is really good, baldurs gate 3 kinda, darkest dungeon, Valkyrie chronicles 1 & 4

Jagged Alliance 2 (especially with the 1.13 mod) is the most ludicrously detailed tactical RPG you'll ever find. It can be a nightmare to actually play until you spend many, many hours learning all its systems, but nothing else comes close immersion-wise. You can customize every mercenary's loadout down to individual weapon attachments, capturing different parts of the map gives bonuses that actually make sense (like being able to ship in weapons once you've taken the airport), you can train militias to hold onto captured sectors for you, and you can even use the in-game internet to send flowers to the main villain.

FFTactics like others was my favorite.

I quite enjoyed into the breach.

I bought a couple of tactics like games on steam and they all dont seem to be fun to me. I guess I like to grind a bit on fair but punishing tactics titles.

X-Com - UFO Defense and TFTD are definitely my favorite. Fallout 1&2 are a close second and I've been meaning to play through them again. Ogre Battle is a distant third, with Front Mission right behind it.

If you enjoyed Into the Breach, take a look at Tactical Breach Wizards. Not much of an RPG, but the combat is similar to ITB. Not as difficult though.

Commandos was super cool. But I suppose it is too difficult by modern standards. Not a RPG though...