**Neeko wears her heart on her sleeve, and there's nothing wrong with that. **
> "The Oovi-Kat were peaceful beings, of unrivaled potential. Their harmonious society blended seamlessly with the spirit realm, so that their sho’ma—their spiritual essence—could intermingle with other beings through mere proximity"
It says it right in her lore, she finds words "confining". She professes her love, hate, curiosity, anger and sadness to whoever whenever, because she's an Oovi-kat. Her tribe used their souls intertwining to communicate, that's why she has no boundaries. Why hold back from telling people you think shyvanna is really hot if you've spent your life letting your friends and family feel and experience your soul? Before her tribe was murdered, anyone could know that she liked them simply because they could feel it in her Sho'Ma. Like her bio says,
> "No secrets existed between the Oovi-Kat,"
So actually, it would be WAY out of character for Neeko NOT to say "hey, you're a cute girl! HELLO!". She has no concepts of secrets, she's used to having her whole identity out for others to see. She doesn't need to assimilate to the rest of Runeterra's less... out-there ways.
Neeko tries her best to use words to show her feelings, and even though it seems overboard, her blatant honesty about her feelings is all she knows.
On another note, to those of you saying that she's "one dimensional" because she talks about being a lesbian too much, I'd like to say, "huh?". She has around 5/6 lines about female champs that she likes. There's so much more to her. If a gay person talking about her sexuality is too much for you, that's your problem. This isn't "rubbing her sexuality in your face" it's people refusing to accept characters that don't act like them.
I mean come on, zoe has 10+ lines about how she wants a boyfriend and no one said anything! Zoe's mentally around 12-ish, and Neeko is around 16-19 (confirmed by a rioter somewhere), so she has more reason than Zoe to have crushes, she's a full-fledged teen! Awkward crushing is a hallmark of teenhood.
Let's just enjoy this new champion please, she seems real fun!