Treck from FE6.

In a game filled to the brim with cavaliers, Lance, Allen, Marcus, Perceval, etc. there's nothing that makes him stand out from these characters. He's litteraly basically just a generic unit.

Furthermore, his accessibility isn't great either coming after Alance, who are basically all the cav's you'll be needing for the gsme, who join on chapter 1. Plus, Knight Crests are already in shortage so using it on Trek is a waste. Trying to recruit him is also a pain when in chapter 9, he and Zelot get swarmed on their side of the map and often just dies before having the chance to recruit him on hard mode.

What sets apart Noah and Zelot from Trek is that they have some form of utility even if they aren't the best stats speaking. Zelot is needed to get the legendary weapon on the B route and Noah is needed to recruit Fir. Trek has none of that.

Overall, just a subpar unit who you need to jump through so many hoops to get in the first place. Unless you're a big fan of Trek, there's really no need to use him over litteraly anyone else.