Sadly, as much as I like Georg, I never take him into the final battle because of his abmisal magic defense stat. First time in New Game + I used him and I had to heal him every time. Same with Zegai and Belcoot. I gave Zegai power + double strike and let him us his Wrath rune to fury himself, he'd do 3000+ damage every hit. He just got taken out of the fight in the second round and I'd have to heal him up.
Prince - because you kind of have to, but he's still a solid fighter.
Lyon - Again, you kind of have to, but again, no real complains in the fighting department.
Miakis - She always goes into the final battle. Use her as backup healer behind Prince+Lyon's rune combo. She's amazingly fast, durable, agile and has a good chance of instant kill if you give her the Killer Rune. That, and she's one of my all-time favorite Suikoden characters period.
Zerase - With the Star Rune + Magical Rune she does massive damage to all enemies with the Comet spell. Give her a Magical absorb, max her magic stats and magical rings and she's a powerhouse on the battlefield.
These four are the primaries, the others tend to change depending on my mood. Others I use are...
Rahal - Strong fighter and mage. Drop his Flowing Sword Rune and give him a Flowing Rune and he's a strong magic user. Fairly quick, strong attack and good defense and magic make him well-rounded.
Kyle - Similar to Rahal, I think he's got a little better stats. I generally give him a Cyclone Rune for max damage.
Gesche - For being a farmer, this dude can dish out a ton of damage. Give him the Windspun gear and his speed is comparable to the Prince. Unlike a lot of other tanks, he seems to have good magic defense as well, so I didn't have to revive him every round.
Cathari - What she lacks in multi-hit opportunities, she makes up for in sheer power. Give her a Double-Strike + Power rune and its bye bye enemies.
Viki - Give her a Pale Gate Rune or Cyclone Rune, with her chance of double casting it can be brutal.
"It doesn't matter if the glass is half empty or half full...what matters is the glass."