Warning : Yandere hints ¿??????? Idk
IDW comic's Leonardo ( This one might be much vague since i didn't read the next comics after Leonardo's stopped being mind controlled )
Depending on his mood he might be more open about PDA some days ( Special occasions , peace before / after war, etc ), but in general he likes to keep it simple in front of others and let himself go in private
Unless you already know or start training self defense he won't let you go on missions , he would try to convince April to persuade you to stay with her while they do their stuff
Tries to take you beautiful or aesthetic places , but more often than not you two will be interrupted , so to avoid that he started to give you more gifts and spend more quality time inside a safe place
He loves it when you compliment his appearance , but if you compliment his skills and wisdom ? OOF , this man would be all giggly and blushing like a school boy
Denial and silent jealousy , he would not communicate his thoughts and would try himself to stop thinking that way , but it only gets worse . Fortunately , when he's on the edge of exploiting he would try his best to talk with you about it
Even when he's on the foot clan he would still choosing you
He would probably kidnap you and force you marry him and keep obedience and loyalty towards him ( And if he was feeling threatened by certain someone close to you , he wouldn't doubt twice on hurting them bad enough to make them know who you belong to )
After it's all over he would apologize for his actions and spend more time with you than before
Although his jealousy might be transform into more straight to point , being a little sharp with his words but nothing extreme
At first he would be shy with PDA , but as times passes by he would start to care and less about what other people has to say
Wich would leads to a shameless romantic Leonardo
The ego bust when you compliment him is insane , he might act all humble but he won't stop smiling proudly for your words
Quality time and service are his main love languages , but gifts with sentimental reasons behind them are also a good part of him too
Rarely gets jealous since he trust you with his heart , but that doesn't stop him from not liking a person at all for trying to hit you ( Worse if they know that they were dating someone )
He would act fake nice to the point it's way too obvious for everyone in the room that he's not content with their presence , and would act clueless if you said anything about it
10000000+ points if you're good with kids and eldest people , makes his heart go brrr for you
Ok so first to talk about this version I say that if you decide to keep being his friend you have to teach him a lot of stuff ( Maybe I'll add a HC )
Maybe you're a close friend of the turtles , maybe you're Leonardo's partner / ex
The thing is that you were just or more patient with him than his counterpart , making him reflex about his existence , morals , actions , everything
So he decides to stay on Earth and try to be like the other turtles , to give his " brothers " a better life far from their creator
So , after a long time of learning , communicating and spending time with you , he decides to date you so he can be finally your boyfriend ( You told him that mate is weirdly used to call a partner here , he asked why , but you avoided the question flawlessly lol )
That being said , he would be slow with PDA but once he learns all the types of affection , he would SHAMELESSLY french kiss you , talk about how good you were last night , hug you on the air , etc
Even he's more civilized than before , he would steal without care things that he knows you like or need ( Be careful with saying " Oh I wish I had money to buy x thing" he won't think twice on breaking the law if it means he'll get it for you )
Cuddling with him is cool until you wake up first but he don't , and he won't let go even in his sleep ( Might even pull you much closer like if he's trying to absorve you with his body )
Yes , he did learn the sharing importance , but with you ? Hell nah , he growls to anyone who is way too much confident with you , including his brothers , but specially humans and the og turtles ( Leonardo having it worse , he would probably get hurt more than once just for talking with you inconveniently alone )
If you talk with him about his jealousy he would try his best to not push you away , but don't expect it to happen soon or fade away completely
Your loyal servant at lifting heavy weights , helping you get something out of your reach , etc , but if you don't know how to fight or be just as strong as him , good luck on trying to go on a mission / train or put yourself at any danger
Really shy with PDA , but he would excuse himself as " respectful " with you in front of the others
Would steal flowers and clothes for you , and if you get mad for him doing it , he will ask April for help to buy you things that he thinks that you would like
Tries to call you everytime that he can to check up on you
He can't listen to love songs anymore without thinking about you , so if he's far away from you he would probably try to avoid them to not get sentimental
He likes to help you clean , but hates doing the dishes and washing clothes , he hopes you do those for him
In private , he would tease you with dirty jokes just to see you blush
Tries to be on time with your dates , but fails , and feels like the worse boyfriend in the world
Silent jealous , but he tries to be logical about it , but in the end makes him more self conscious , and goes to Splinter , April or Donatello for an advice
Kinda of a stalker , but only if you are out of your home
Loves quality time , it's his first love language after service
Always makes sure you ain't there when he's killing someone , doesn't want you to get traumatized or scared of him
Not totally shy with PDA , but if he didn't initiate it , he would get all blushy and flustered
Writes you his favorites songs lyrics in letters
Would ask April to buy you clothes on his color
He would probably suggest more than once to investigate if it's possible for a teenage couple to marry , do not tell him the truth
A lot of pet names for you , and for him , it only takes the most cheesy pet name to convince him to do anything you want
Would try to learn how to cook better for you
Dramatically jealous , but it only takes a kiss or two to calm him down
Movie dates are now your routine
His main love language is physical / verbal affection and service
50/50 with PDA , he would hug you all you want but he's shy with kisses in front of others
In secret would steal things that you like but he would tell you that he found them or bought them
From time to time likes to give you a drawing , sometimes of you , landscapes that you both visited , your most used stuff , etc
He would totally ask you to come to the sewers and " help " him on training ( not against you , he just can't ) , but he only wants to show off
Silent jealous but he would be too obvious about it that it's not even silent anymore , but nothing that a good talk can't resolve
Would also try to show off his dance skills , but he doesn't know how to slow dance , in that case he would try make himself invisible
Would give you his slice of pizza and katanas if you ask nicely ( You know , the type of flirty nice )
Quality time and gifts are his main language