Ace Light is so important to me. Like it's not just a headcanon but something more. Here are some instances of ace!Light imo:
When Sayu finds Light with a dirty magazine & he explains that 'no i was just looking at articles of Kira & L' and that makes Sayu go 'oh yeah! you're gonna be a detective in future so being the nerdy brother of mine that you are you're studying for that, too. wow.' LIKE SHE DOESN'T EVEN QUESTION IT FOR A SECOND. She just knows that Light's statement is true at its face value & since she knows him well: therefore I raise you ACE Light.
Then this exchange between Ryuk & Light:
Ryuk makes a reference to finger-banging and Light's response? 'Looks are all that count!' Light is so ace it's cute haha.
Instance #3:
Light looks at p0rno mags and Soichiro is SHOCKED. Now of course it's because he thinks that Light was too upstanding/well-behaved for this sorta thing but I cannot help but wonder... if Light being interested at looking at girls that way, might've seemed a lil too far-fetched to Soichiro. And just how is Light looking at the scantily-clad women? Take a look:
Of course, Light's goal is to pretend that this is why he was checking if anyone entered his room and yet he cannot look more disinterested. It's not convincing that he'd go all through the trouble of ensuring nobody entered his room and look like -_- towards the p0rno mags he had tried so hard to hide. He's in the privacy of his room (yes there are hidden cameras & no Light isn't meant to know about them) and the least he can do in what I remind you that it's a Shonen manga which means that it's targeted towards young male teens so they couldn't show him jerking off or anything is to look like he's interested/attracted to these women but nope.
Light with all his acting skills cannot manage to look interested (let alone sexually interested) in women shown in these mags. So Light is not straight confirmed. Ace Light strikes AGAIN.
This is just an aside:
Ace!Light is done with Ryuk & the ridiculous sexual positions he comes up with for Light & L lol.
Another aside:
"Misa: Hey, Light. Wanna come sleep with me tonight?
Light: Wh-what are you talking about…?
Misa: Ha ha ha! Just kidding! You're saving me for after we catch Kira, right? You don't have to be shy about it!
L: Yes, Light. There's no need to be shy.
Light: I'm not being shy!
L: No need to be so serious either."
Hahaha look at L & Misa bullying our dear ace!Light XD
Instance #4 (sorta):
If we needed more proof of Light not being straight- it's that look on Sachiko's face. She is positively stunned haha.
Instance #5:
Here is Misa hinting at something (presumably romantic/sexual) they'd do under covers and Light just completely dismissing it with a 'whatever'. #ace light
Canon shows us again & again how disinterested Light is in dating women (he does so only for achieving his Kira goals). Canon also hasn't hinted at Light preferring to date men (no offense to those who headcanon Light as gay as I'm one of those people (i hc him as homoromantic asexual)). So it's logical to assume that Light is ace. Yeah yeah I know you don't really need canon basis for your headcanons but as I said before Ace Light is more than just a headcanon to me :D
Oh and Light being an 'ace student' is literally canon ;)












