Izuocha

He took her out for a date and then took her to a lake and got down on his knee and told her he loved her and asked her to marry him and presented a ring to her

Todomomo

He just flat out said "Let's get married." While they were just laying down cuddling

Kirimina

He got the entire Bakusquad to set up a light show. The power went out and Denki had to be their back up power supply. But it was a success. And Bakugo actually came up with the idea.

Kamijiro

He wrote a song and performed it for her on a stage. Then he called her into the stage and proposed.  

Iidamei

He put the box and a note on her desk when she fell asleep. She woke up, saw it and was so excited she made an entire machine to say yes.

Tokotsu

She proposed to him. She took him out to a lot of places that were sentimental for them and then actually got in her knee and proposed to him. He blushed and had no idea what to say and Dark Shadow pops out and tells her that he was planning to propose soon.

Ryushot

He proposed in the place they had their first date

Miruhawks 

She was pregnant so they agreed to just get married before the baby was born

Erikota

He invited all their friends and family to lunch and the two went on a boat ride and he proposed in the boat. She got too excited and threw herself onto him to give him a hug accidentally tipping the boat and making them both fall in.

Hitorei

He was too shy so he slipped the ring onto her finger while she was asleep

(Extra)

Kacchako

He set up his own candle lit dinner on the roof and threw rose petals everywhere and even got dressed up and he proposed there.

Toodles! X3