Breath of Fire: Endings (With Spoilers)

Warning: The following contains major spoilers.

There are two endings for Breath of Fire. To see both in one playthrough, I believe the easiest way is to quicksave the game after Tyr says "I haven't done anything. Don't hurt me."

You can then load from your permanent save, and head through the last dungeon again. Make sure you have Agni.

Speak to Tyr again. Agree to be her friend, and Sara will appear. Sara tells you, "Ryu, use the magic of Agni! She'll reveal her true self!".

Tyr replies "I am not! I've done nothing!".

Sara says "She'll fool you with her innocent looks. She's evil, but she'll hide it. Don't be fooled!"

Bad Ending

To get the bad ending, completely ignore Tyr's advice. Use Rudra and Puka to whittle away at her (approximately 21,000) hit points.

After the battle, Nina will say "it's finally over." Karn will agree, "it's about time!", and Deis will comment that "it was actually easier than I thought."

Ox says "We were much stronger, right Ryu? ...Ryu?"

Ryu is paying attention to Sara, who is fading away. She says "You've succeeded. The world is in your debt. Go! Warriors, Go!"

Karn asks "Go where?"

Nina tells him, "We've got to help people rebuild their villages and towns."

Karn says, "Oh, that's right!"

The party says "let's go!".

The screen fades to black, and you get to watch the credits.  Afterwards, you'll see Tyr again, who repeats "I haven't done anything.  Don't hurt me."    She then transforms into her creepy form.

Good Ending

Load your quicksave file. This time, when you battle Tyr, follow Sara's advice, and use Agni. After attacking her in that form, Tyr will stop the battle.

She says "You can't challenge me to a fight! You're only humans. I'll destroy you all."

She then transforms into her creepy form and says "I...don't believe this!"

After defeating Tyr as a six-headed snake goddess (with around 30,000hp), she'll say "You can't win humans. This is only temporary. I shall return," before disappearing in flames.

The sky behind her will transform into steel, which will begin to fall away. Ryu falls with it. Bird warriors from Winlan catch the party.

Outside Winlan, Sara's ghost says "I'm proud of you, Ryu. You turned the tables on the Goddess of Destruction. You and your companions completed the mission of the legendary warriors. This is the beginning of a new legend. I have watched you succeed. So, I have no regrets in leaving you."

Finally, Ryu speaks. "Wait!"

Sara turns back and says "Goodbye, Ryu. You made me proud. You are a true warrior."

Then she disappears. In her place, the Dragon Lord appears, who says "You have done well. I'll remember that you saved the world. This is the beginning of a new legend!"

Nina says "it's finally over." Karn agrees, "it's about time!"

The Dragon Lord told them "There is still much work for you. You must help those who lost much during the war."

Karn asked "Can't we take a break?"

Bo tells him, "A real hero doesn't quit until the job is done."

Nina adds "we're making history! We'll all be legends, someday."

Gobi says "that's right. Oh, don't forget, you still owe me money."

Karn moans "Again with the money! Is he worthy of hero status?"

The entire party says "let's go!"

A soldier says to the Princess, "Nina, we should return to the Castle. The king is waiting."

Nina tells him, "There's still a lot of work left to be done. Tell the King that I'll return when I'm ready."

As a giant bird, Nina flew all over the world. Mogu showed off his digging skills in Gramor. The party got lost in the desert, and Deis went back to bed. Ox celebrated the birth of his new child. Gobi set up shop. Karn returned to Bleak. Nina, Ryu and Bo mourned the stone robot at the volcano, before leaving Bo in Tuntar.

Ryu and Nina headed back to Winlan. Finally, Ryu returned to Drogen, where the light dragons were rebuilding. He didn't stay. Instead, he walked off into the sunset, thinking of his sister.

After this, you'll get a much better credit sequence, and you'll be thanked for playing.  Then you'll see a picture of Ryu and Nina, before seeing the words "to be continued" over a picture of Ryu from Breath of Fire II.