RX-78GP01-Fb Gundam GP01 Fullburnern (RX-78GP01-Fb ガンダム試作1号機フルバーニアン), known under the codename "ZEPHYRANTHES Fullburnern" (ゼフィランサス・フルバーニアン), is the second Gundam Kou uses in battle. It's a part of the Gundam Development Project devised by the Earth Federation after the One Year War (Mobile Suit Gundam). Unlike its first iteration, Gundam GP01, Fullburnern is built to completely withstand space combat. Gundam GP01 was planned for the upgrade once reaching the Federation's space facility, but an attack by the pro-Zeon forces cut their plans short and wrecked the Gundam unit.