He still has the teddy bear from when he was a kid. Its name is Rex.
He might not have finished high school, but he went to university classes. He was never enrolled, he just showed up to lectures for as long as it took for the professors to figure it out.
His nipples have been pierced and he has no recollection of it happening.
His parka pockets are full of lollipops and little fidget toys to give to kids when they seem upset.
He has robbed Oliver Queen at least three times.
He doesn't dress high femme very often, but when he does, he goes the whole nine. Slinky silver dress, stiletto heels, fur stole to demurely hide his smiles behind. He sucks at doing makeup, though. Lisa does it for him. The rest of the he presents as femme, he dresses more like Charlie.
He's met Constantine before, at a bar in New York. When John made a pass at him, he pretended not to understand what he meant. This went on for a good twenty minutes, and he conned a plate of mozzarella sticks out of him.
While not as skilled as Lisa, he's still a talented figure skater.
He anonymously sponsors several children's hockey teams.
He has broken into the Flash museum, specifically to rearrange the figures in the Hall of Villains.
He is ridiculously proud of Owen for becoming an Outsider, he just wishes he would have waited until after finishing college first.
He now keeps spare pyjamas at his houses for Wally.
There are just as many photos of the Flashes in his houses as there are the rest of his family.
Because of Wally sharing his speed with him, he now has a faint connection to the Speed Force, and is able to sense when a Speedster is scared or in pain.
After the events of Identity Crisis, he sent condolence flowers and a care package to Tim, and regularly keeps tabs on him.
Related to the previous, he knows the identities of the Bats (and most heroes for that matter). He just doesn't care. When it's eventually revealed that he knows, his explanation is 'My sons are attached to your sons. It wasn't hard to make the connection.' Which leads to Owen and Tim both blushing like idiots, and Wally just face-palming because 'We've been over this, you're not my dad, Leonard. I'm twenty-seven, and you are my enemy. You are... Okay, thanks for the sandwich.'
He doesn't bother hiding the stolen Stanley Cup. He uses it as a dip bowl sometimes.
He's lactose intolerant, but you will pry this ice cream cone out of his cold, dead hands.