I don’t know if I would call a comedy about a group of vampires that are roommates living in Staten Island as ‘light hearted’ but I’d suggest What We do in the Shadows. Think the office/parks and rec style work place moucumentary sitcom with characters totally out of touch with reality and the time they’re living in turned up a bit on the absurd.

Better off Ted.

It's 15 years old now, but the jokes are top notch.

What We Do In the Shadows.

It's another one from Taika Waititi, who did our Flag means Death. Probably his best work, yet. Plus it has Matt Berry!

It's a fake reality TV documentary about a group of vampires that are roommates in an old house on Staten Island, and their human servant who helps them with the promise they will turn him some day.

Idk if it fits what you're looking for, but Dirk Gently popped to mind when I read your post. Or maybe The Good Place.

If you like those shows, check out Norsemen on Netflix. It's like vikings but very silly. Very tongue in cheek.

Miracle Workers with Daniel Radcliffe, Steve Buscemi, and a great cast. Each season is a different setting, it's so good.

https://www.youtube.com/watch?v=ymOWZkY1b5Y

Resident Alien has a similar mix of comedy and serious sci-fi as the Orville.

It's fucking amazing too!

Have you seen Star Trek TNG? If not, then check that out, since it's the inspiration for The Orville. It's not as comedic, but it's hopeful and not dark, and there's a decent amount of comedy in there. Skip season one if you're not a Star Trek fan.

If you enjoy a little bit of history, you might enjoy Detectorists. It’s fairly short, but it’s a fun watch.

Community can have some really great writing (dips in season ~~3~~ 4, but recovers in ~~4~~ 5).

30 Rock, Parks and Rec (particularly picks up once two new members join the cast), the Good Place, and Brooklyn 99 are all usually pretty light hearted and fun.

Scrubs can be very funny, but also has some somber episodes where you'll find some of the best writing is the series. Generally more fun than grim though.

The writing quality in how I met your mother was good for the first few seasons, but dropped off in the latter half.

Friends was pretty consistent, but not as good as some of these others, for me at least.

The Oreville is inspired by Star Trek, particularly shows like the Next Generation. That's a good series with some great episodes, but has some filler lower quality between. Not as silly as the Oreville, but some are still fun. Others are interesting or exciting in a variety of ways.

I haven't watched What We Do In The Shadows, but it is on my list for the same reason you asked the question.

If you're just looking for something wholesome and entertaining, Schitt's Creek is probably a good one.

I've heard Ted Lasso and Kim's Convenience have similar wholesome vibes, but haven't watched either.

What we do in the shadows, for sure.

Another show you may have already watched but it's the first thing I think of when talking lighthearted is Parks and Recreation, though the the first season is not good.

The Completely Made-Up Adventures of Dick Turpin has a similar vibe to Our Flag Means Death, maybe a little goofier. https://www.imdb.com/title/tt19516036/?ref_=ext_shr

Strange New Worlds is the closest I can think of to a current show that is somewhat close to Orville.

Brooklyn 99 comes to mind.

Also Reservation Dogs and Atlanta, they have a bit of surrealism while telling amazing stories and being funny.

Check out Lodge 49.

What we do in the shadows

If you want to keep the space theme going, Star Trek Lower Decks is lighthearted an fun. It probably helps if you've seen lots of Star Trek, but I'd say give it a shot.

I'd also recommend Bob's Burgers. It's not going to give you much in terms of long term story arcs, but each episode is its own self contained story. The family in the show is just great and fits your lightheaded criteria.

You might want to have a look at Firefly. It’s a bit odd and a mix of serious and lighthearted and sometimes downright goofy (the hero of canton 🎵), which makes it one of my absolute favorites. Please just watch it in the dvd release order, they seriously messed it up on tv.

Have you tried Our Flag Means Death fanfiction? My wife is really into it lol.

Guessing you're after found families.

Mythic quest: raven's banquest. Stick with it. The first few eps are middling, but then they find their feet and voice

What we do in the shadows, same deal

Ghosts - cbs or bbc, both good in different ways. Bbc is gentler, cbs is unhinged in the best way

Letterkenny is fantastic.