Your passive ability is that you can hear enemy noises louder then normal. Your side ability is that you can sing a soft Lullaby, putting an enemy to sleep for 5 seconds. Your ultimate is that you can sing incredibly loud and sleep many people around you.
Your Pov~
I fiddled with my fingers nervously as loud voices soon filled the quiet room. Mirage! Would you like to team? And Lifeline! We could really use you on our team! I looked around nervously, the anxiety bubbling my thoughts. Would someone want to even team with an anxious newcomer?

"¡Hola, Amiga!" I heard a Spanish voice cheer . I jumped and gasped, then caught my breath. "Ah, forgive me! I'm Octane, haven't seen you around!" He held out a hand to shake. "U-Um..." I looked to the side. "Y-Y/N.. Or Lullaby.." I shook his hand hesitantly. "Cool, cool! Would you like to team? Everyone else seems to have a group already except us, mi amiga." He said, looking directly at me. "Ah-- me..? Sure." I said nervously, with a scratch to the cheek. "Yes! We'll be the dynamic duo!" He nudged me. "¿Si?"
I looked at him, "Yeah- I mean- uh.. si!" I smiled slightly. He laughed.
I felt my face heat up. What is this... this feeling? It's not anxiety, no.. Fear? No... is it... is it love? Can't be..

Can it?

"O-Octane... um... I've never done this before.." I said, staring off the edge of the opening of the plane. Fear and anxiety caved around me. I felt like it was me versus surviving a jump into a volcano. "Oh? That's okay, Lullaby! Just follow me!" He beamed, grabbing my hand and jumping out of the plane. I squeaked and closed my eyes tightly. I felt my feet hit the floor and I opened my eyes again. I suddenly felt two things land in my hands. "A Havoc Rifle and Eva 8 Auto for you, mi amiga!" I stared at them and put the Havoc rifle on my back. "W-What do you have, Octane-?" He looked at me. "Ah, I have a G-7 scout and a peacekeeper!" I nodded slightly, "B-Be careful, I hear enemies close.." I spoke and looked around. "Yes, and I think the enemies are coming TO us! Be ready!" He beamed and stood by one door, then I stood by the other with the Eva 8 in my hand. Two people came through my door and a popped both of them in the head, but it didn't kill them. They both shot me in the same arm, and I winced. Then I started singing a lullaby. I fired  at them with the havoc, knocking them both.

"Squad wipe!" I heard Octane beam, looking through the person he killed's loot. I looked through the people I killed's loot, and found no med kits. I cursed under my breath and turned to Octane, holding my arm. "Octane..? Do you have any.. any med kits or anything?" He looked at me. "Aye! Come here, amiga." I hesitated, "Uh,, I can do it by myself-"
"It's fine, amiga! Let me help you." I couldn't see it, but I could tell he was smiling. I sighed a bit and sat next to him and he started bandaging my arm up.

I glanced at his legs. Huh, robotic. I wonder what happened to them. "I see you, such wandering eyes!" He laughed. "I'm kidding, I blew off my legs! No need to worry about them getting tired." My eyes widened. "Blew them off..? That's... A bit crazy." I stood up and stretched. "Yeah-! And watch this-" He stabbed a syringe into his leg. "Catch me if you can!" He zoomed off.

I ran after him, but it was an extreme hassle to keep up.

After many battles, there was finally a single enemy squad left. We were placed on top of a roof. "Ok here's the get go- you sing a lullaby to the whole squad, then I use my jump pad so I can jump off and we can kill them all. ¿Si?" He looked at me. "Mhm... they're right below us." I smiled and saluted before jumping off, surprising the enemy team. Perfect, the shock gives me time to sing.  I sung a loud Lullaby. The enemy time drowsily fell to the ground, and then I signaled Octane to come down. We blew their heads off! I smiled at him and nodded. I was about to walk over, then I tripped.
And guess what? I fell right Into his arms.
He laughed and my face fumed red. "Oh, Oh Y/N. Such a clutz.. but ¡te amo~!"

I was not the fluid in Spanish, but I had a good understanding of what he said.

And I feel the same.

808 words! :)