Tsuyu's frog - like quirk gives her abilities like enhanced jumping and a long tongue for grabbing things. In a fanfiction, her quirk could be used to quickly rescue Deku from a dangerous situation, like pulling him out of the way of an incoming attack. Meanwhile, Deku's One For All could be used to power through tough obstacles when they're on a mission together.
An 'animal deku fanfic' is likely a fan - created story about the character Deku in an animal - related context. It could involve Deku having animal - like abilities, or being transformed into an animal. Maybe it's a story where he interacts with other animals in a unique world. Fanfics often take existing characters and put them in new and creative situations.
It's hard to say for sure. Deku has grown a lot, but All For One is a powerful villain. It depends on various factors like their current abilities and the circumstances of the battle.
Bakugou could use his words. He might tell Deku that he believes in him. For example, he could say 'Deku, you may be a nerd but you're a strong nerd.' It's a backhanded compliment but it shows he has faith in Deku.
Well, Deku does lose his quirk. However, this event leads to new developments and challenges for him. It's a crucial plot twist that adds depth to the story.