"AUUGGH! MIHOSHI!!!" Is a commonly heard phrase around the Misaki household (and just about everywhere else, too.)

Mihoshi is a first-class detective of the galaxy police and is actually pretty good at what she does. She's generally a ditzy dip who is messing up stuff (pushing buttons she's not supposed to, crashing her space ship, etc.) but at times she is quite brilliant.
Remember Washu's husband (OVA #8?) he had blond hair and so did Washu's baby. It's suspected by some (including me, just a little) that Washu's baby is a relative of Mihoshi's, which means that I (Li'l Washu) might be the great-great-great-great-great-great-great-great-well, you get the idea, grandmother/aunt of Mihoshi! This would explain some of Mihoshi's brilliance, and also why she can be so silly at times (just like I, Washu, can be.)
As I said Mihoshi is very good at her job, especially at submitting reports.
She tends to write quite exhaustive but thorough reports that can sometimes take days to analyze. She usually ends up getting the bad guys but still not having a clue, which is fun. She's definitely tied with Sasami as my second favorite character.
Mihoshi loves karaoke and is a relatively okay singer. Well, if not a good singer, then a funny one at least. (Go see the karaoke song that she and Kiyone sing in the TV series!) Karaoke, now that's what she likes to do to relax.
Speaking of relaxing, that's about all Mihoshi ever does. She loves to eat, loves to sleep, and is completely carefree. "Ooh! How many hours of sleep a day can Mihoshi possibly need!?" That's a question to which the answer is of yet not known and will probably be a gag for many more a Tenchi series to come.
In the TV series (Tenchi Universe) Mihoshi has a partner who has to look after her constantly: Kiyone! "Oh Kiyone! I just knew you would come rescue me! You know, we have the best partnership in Galaxy police! Oh Kiyone, what would I do without you?" In the Universe series, everything seems to be alright just as long as Kiyone tolerates Mihoshi, which she always ends up doing.
In ep. #8 of the TV series, Mihoshi's personality gets transferred to a robot likeness of Washu by accident! (very funny!) "WHAT?? HOW COULD YOUR MIND DATA OVERRIDE MINE??? AND THROUGH A SINGLE PIECE OF HAIR???"
A great episode, it not only has mecha washu (as both Ryo-Ohki and Mihoshi) but also some interesting things about Mihoshi. For example, by now we all know that she like to watch 'The Happy Kid's Playtime Hour.'
"It's time for the Happy Kid's Playtime Hour! And how are all you happy kids today?" "Fine! And you?"
She also likes to watch Moldiver which is... interesting. (Hmm... anime watching anime? Is that possible? Must be, I guess, since they did it.)
To add to her silliness, Mihoshi is quite the crybaby (which isn't a bad thing at all, really.) For example, you know in OVA #8, when they're taking care of Li'l Taro and he starts crying?
"Oh, please don't cry! *sniff... sniff... sniff* WAAAAAAAAAHHH!!!"
As I said before, Mihoshi screws up a lot, (very much the first class klutz), but who doesn't? Only thing is, these aren't your average every day li'l goofs, oh no, these tend to be great whopping mess ups that could get them all killed! For example, in TV series episode # 21 (No Need For a Checkpoint!) She goes through these little metal detector thingies that they have at the checkpoint and it beeps. Why did it beep? Her pockets had metal in them. What sort of metal, one might ask? Keys, paper clips, bottle caps, her license and her galaxy police issue gun!!! (Smart one there, Miho!) Or like how she didn't know how to control that lazer shooting space suit she wore when Kiyone came to earth to rescue her and tried to capture the space pirate Ryouko? There where lazers shooting everywhere and she was next to crashing into people! Even in the first episode of the TV series (Yaay! she was in the first episode!) When she's in a similar space suit and is in pursuit of the space pirate and she trips on a coke can? It's sort of a 'Help! I've fallen and I can't get up!' thing going on. (it's kooky!)
But there are times when Mihoshi screws up which turn out to be for the better. Not very many of them, but still.
Like in episode #13 of the OVA series where she crash lands in the pond by Tenchi's house, flooding the area and defeating Seiryo (yaaay!)

Funny, cute, and sexy, that's Mihoshi. But she's mostly juuust Cray-zee! Who knows, though? She may just be a genius incognito.
I'll add on some more about her when I can, okay?