the thing with time travel is

Outwardly chill in 99% of situations

Incapable of shutting up

Has a crush on every friend

The coolest kid in the universe (note: not actually cool)

Does stupid things in the name of "irony"

Crows love him for unspecified reasons

Reluctantly skilled in the art of the sword and time travel-supported insider trading

It'll be a cold day in hell before he takes off the shades. Yes, even in dark rooms

Backtagging: Yes
Threadhopping: Yes
Fourthwalling: Yes

Hugging this character: Yes. He's extremely unused to non-violent physical contact though.
Kissing this character: Ditto above.
Flirting with this character: Yes. He will not take it seriously.
Fighting with this character: Yes. He doesn't like it, but he'll do it if he has to, featuring cool ninja moves and time related powers.
Injuring this character: Yes. Discuss with me beforehand.
Killing this character: Yes. Discuss with me beforehand. He is conditionally immortal so self-resurrection is a thing.
Using telepathy/mind reading abilities on this character: Yes. He will hate it and depending on the severity of the power, may react violently.

Warnings: Dave is extremely cavalier about his own death which has occurred many times as part of his time travel shenanigans. He also comes from a both physically and emotionally abusive home. If either of these topics bother you, let me know and I can avoid them.