Songbird Serenade has no issues being fat. Here's her card's info: BUBN-EN008: OBs Sia LIGHT | OBs | Level 1 | ATK 300 | DEF 2500 Cannot be Special Summoned unless you control "Fat Formula". Cannot be destroyed by battle. If this face-up card battles: The other monster loses 1000 ATK during the Damage Step. OBs and XL monsters cannot change battle positions. (Super Rare)
